Grammar - English Writing Styles: Formal, Informal, Academic, and Business Writing
English Writing Styles: Formal, Informal, Academic, and Business Writing
English changes according to who you are communicating with, why you are communicating, and where the communication will be used.
The four important styles are:
Formal English
Informal English
Academic English
Business Writing
These styles overlap, but they are not the same.
1. What Is "Style" in English?
Style is the way language is chosen and organized according to the situation.
For example, the same idea can be expressed in four different ways:
Situation: You need more time.
Informal:
I need a bit more time. Can you give me another day?
Formal:
I would appreciate an additional day to complete the task.
Academic:
Additional time may be required to complete the analysis accurately.
Business:
We would appreciate an extension of one working day to complete the report.
The basic meaning is similar, but the purpose, vocabulary, tone, structure, and level of directness are different.
2. The Four Styles at a Glance
| Feature | Informal | Formal | Academic | Business |
|---|---|---|---|---|
| Main purpose | Everyday communication | Serious/professional communication | Explain/analyze/research | Achieve a business objective |
| Audience | Friends, family, familiar people | Officials, unfamiliar/professional audience | Teachers, researchers, students | Customers, managers, colleagues |
| Tone | Friendly, relaxed | Respectful, serious | Objective, analytical | Professional, practical |
| Contractions | Common | Usually limited | Usually avoided | Usually limited |
| Slang | Common | Avoid | Avoid | Avoid |
| Personal language | Common | Moderate | Limited/careful | Depends on purpose |
| Emotional language | Common | Limited | Usually limited | Limited |
| Technical terms | Usually few | Depends | Often important | Often industry-specific |
| Evidence | Usually unnecessary | Sometimes | Essential | Important when relevant |
| Directness | Often direct | Polite | Cautious | Clear and action-oriented |
| Sentence style | Simple/conversational | Complete/formal | Complex/precise | Clear/efficient |
| Main priority | Relationship | Respect | Accuracy and evidence | Results and clarity |
PART I — INFORMAL ENGLISH
3. What Is Informal English?
Informal English is the language used in relaxed, familiar, everyday situations.
It is common in:
Conversations
Text messages
Chats
Social media
Personal emails
Messages to close friends
Conversations with family
Casual discussions
4. Characteristics of Informal English
Informal English often uses:
Contractions
Short sentences
Phrasal verbs
Everyday vocabulary
Slang
Idioms
Personal pronouns
Emotional expressions
Abbreviations in digital communication
Example
Hey! How are you? I haven't seen you for ages. Do you want to grab some food later?
This sounds natural in conversation.
5. Contractions in Informal English
Contractions are very common.
| Full Form | Informal |
|---|---|
| I am | I'm |
| you are | you're |
| he is | he's |
| she is | she's |
| it is | it's |
| we are | we're |
| they are | they're |
| do not | don't |
| does not | doesn't |
| cannot | can't |
| will not | won't |
| I will | I'll |
| I have | I've |
Example
I don't know what we're going to do.
This is perfectly natural in informal English.
6. Phrasal Verbs in Informal English
Informal English frequently uses phrasal verbs.
| Informal | More Formal |
|---|---|
| find out | discover/determine |
| look into | investigate |
| put off | postpone |
| get back | return |
| bring up | mention |
| deal with | address |
| look for | seek |
| set up | establish |
| put together | assemble/prepare |
Informal
I'll look into it.
More formal
I will investigate the matter.
7. Slang and Informal Expressions
Informal English can include:
awesome
cool
stuff
kids
guys
wanna
gonna
kinda
pretty good
no worries
hang out
Example:
The movie was awesome.
However, these expressions are generally inappropriate in academic writing.
8. Informal English Can Be Grammatically Different
In conversation, people often use shorter structures.
Formal
I do not know what he is talking about.
Informal
I don't know what he's talking about.
Very conversational
No idea what he's talking about.
The last one may be natural in conversation but is not a complete formal sentence.
PART II — FORMAL ENGLISH
9. What Is Formal English?
Formal English is used when you need to communicate in a serious, respectful, professional, or official way.
Common situations include:
Official letters
Formal emails
Government communication
Applications
Complaints
Requests
Formal speeches
Reports
Professional correspondence
10. Characteristics of Formal English
Formal English generally uses:
Complete sentences
Precise vocabulary
Polite expressions
Limited contractions
No slang
Appropriate grammar
Professional tone
Careful word choice
11. Informal vs Formal Vocabulary
| Informal | Formal |
|---|---|
| ask for | request |
| help | assist |
| buy | purchase |
| get | obtain/receive |
| give | provide |
| need | require |
| tell | inform |
| show | demonstrate |
| find out | determine |
| talk about | discuss |
| deal with | address |
| fix | resolve/repair |
| start | begin/commence |
| end | conclude |
| put off | postpone |
| look at | examine |
| go up | increase |
| go down | decrease |
Informal
We need to find out what happened.
Formal
We need to determine what happened.
12. Formal Politeness
Informal:
Send me the report.
Formal:
Please send me the report.
More polite/formal:
Could you please send me the report at your earliest convenience?
However, extremely formal language can sound unnatural in everyday professional communication. Good formal English should still be clear.
13. Formal Requests
Informal
Can you send me the file?
Formal
Could you please send me the file?
More formal
I would appreciate it if you could provide the file.
14. Formal Complaints
Informal
Your service was really bad.
Formal
I am writing to express my dissatisfaction with the service provided.
15. Formal Apologies
Informal
Sorry for being late.
Formal
Please accept my apologies for the delay.
PART III — ACADEMIC ENGLISH
16. What Is Academic English?
Academic English is the language used to communicate knowledge, research, analysis, arguments, and evidence.
It is commonly used in:
School assignments
University essays
Research papers
Reports
Theses
Dissertations
Academic journals
Research presentations
Academic English is a special type of formal English.
17. Main Characteristics of Academic English
Academic English emphasizes:
Accuracy + Evidence + Objectivity + Logic + Precision
It normally avoids:
Slang
Casual expressions
Unsupported opinions
Excessive emotional language
Vague claims
Unnecessary contractions
18. Academic English Is Not Just "Difficult English"
This is very important.
❌ Academic English does not mean:
Use the longest words possible.
Instead:
Use the most accurate words appropriate for the idea.
For example:
❌ The utilization of pedagogical methodologies facilitates the optimization of educational outcomes.
This sounds unnecessarily complicated.
Better:
Effective teaching methods can improve educational outcomes.
The second sentence is clearer and still academic.
19. Objectivity
Academic writing generally focuses on evidence rather than personal feelings.
Informal
I think exercise is really good for students.
Academic
Regular physical activity may improve students' physical and psychological well-being.
20. Hedging
Academic writers often avoid making claims that are stronger than the evidence supports.
Too strong
Exercise improves everyone's academic performance.
Academic
Exercise may improve academic performance.
Useful academic hedging:
may
might
could
appears to
seems to
suggests
indicates
potentially
generally
likely
possibly
21. Evidence in Academic English
Academic writing normally requires evidence.
Weak
Social media is harmful to teenagers.
Stronger academic style
Several studies have reported an association between excessive social media use and negative psychological outcomes among adolescents.
The second statement is:
More precise
More cautious
Evidence-oriented
22. Academic Reporting Verbs
Instead of repeatedly using say or think, academic writing uses precise reporting verbs.
| Basic | Academic |
|---|---|
| say | state |
| say | argue |
| say | claim |
| say | suggest |
| say | indicate |
| show | demonstrate |
| show | reveal |
| find | identify |
| look at | examine |
| talk about | discuss |
| think | propose |
| prove | establish* |
*Use prove or establish only when the evidence genuinely supports that strength of claim.
23. Academic Sentence Structure
Academic English frequently uses:
Complex sentences
Relative clauses
Reduced clauses
Passive voice
Nominalization
Subordination
Logical connectors
Parallel structures
Simple
Exercise improves health.
Academic
Regular physical activity has been associated with improvements in physical and psychological health.
24. Academic Connectors
Addition
furthermore
moreover
additionally
in addition
Contrast
however
nevertheless
in contrast
whereas
although
Cause
because
since
due to
as a result of
Result
therefore
consequently
thus
as a result
Example
The sample size was relatively small. However, the results were consistent with previous findings.
PART IV — BUSINESS WRITING
25. What Is Business Writing?
Business writing is written communication used to achieve a practical business purpose.
It includes:
Business emails
Proposals
Reports
Memos
Meeting minutes
Business letters
Quotations
Invoices
Sales messages
Customer-service messages
Marketing materials
Internal announcements
Project updates
26. The Main Goal of Business Writing
Academic writing asks:
What does the evidence show?
Business writing often asks:
What needs to happen next?
Business writing therefore emphasizes:
Clarity
Brevity
Action
Results
Professionalism
Reader needs
27. Business Writing Is Not Always Extremely Formal
This is an important distinction.
Modern business communication often uses a professional but natural tone.
Too informal
Hey guys, just wanted to let you know that we're gonna have a meeting tomorrow.
Too formal
I hereby wish to inform all concerned parties that a meeting shall be convened on the following day.
Good business writing
Please note that the team meeting will be held tomorrow at 10:00 a.m.
The third version is usually best.
28. Business Writing: Be Direct
Business readers often want the important information quickly.
Weak
I am writing this email because I wanted to let you know that there has been a problem with the delivery that we were expecting yesterday.
Better
Yesterday's delivery has been delayed.
Then give the necessary details.
29. Business Writing: Focus on Action
Weak
There seems to be a problem with the order.
Better
Please confirm the delivery date by 3:00 p.m. today.
Business writing should make the required action clear.
30. Business Email Structure
A professional business email commonly includes:
1. Subject
Subject: Delivery Schedule for August 6
2. Greeting
Dear Mr. Smith,
3. Purpose
I am writing to confirm the delivery schedule.
4. Important information
The order will be delivered on August 6 between 9:00 a.m. and 11:00 a.m.
5. Action/request
Please confirm that this schedule is convenient.
6. Closing
Best regards,
[Name]
PART V — THE SAME MESSAGE IN FOUR STYLES
31. Example 1: Asking Someone to Send a Document
Informal
Hey, can you send me the file when you get a chance?
Formal
Could you please send me the document at your earliest convenience?
Academic
Please provide the document so that the relevant information can be reviewed and analyzed.
Business
Please send the document by 3:00 p.m. today so that we can complete the review.
32. Example 2: A Problem
Informal
The computer isn't working properly.
Formal
The computer is not functioning properly.
Academic
The computer system appears to be experiencing a technical malfunction.
Business
The computer system is currently unavailable and is affecting today's operations.
Notice that business writing adds the business consequence.
33. Example 3: Asking for Information
Informal
Can you tell me what happened?
Formal
Could you please provide further information regarding the matter?
Academic
Further investigation is required to determine the factors that contributed to the outcome.
Business
Please provide an update on the cause of the issue and the proposed corrective action.
34. Example 4: Positive Results
Informal
The new plan worked really well.
Formal
The new plan was highly effective.
Academic
The findings suggest that the proposed approach was effective.
Business
The new plan increased sales by 15% during the first quarter.
The business version is strongest when a measurable result is available.
PART VI — VOCABULARY DIFFERENCES
35. Informal Vocabulary
Informal:
We need to figure out the problem.
36. Formal Vocabulary
Formal:
We need to determine the cause of the problem.
37. Academic Vocabulary
Academic:
The study seeks to identify the factors contributing to the problem.
38. Business Vocabulary
Business:
We need to identify the root cause and implement corrective action.
Each style chooses vocabulary according to its purpose.
PART VII — CONTRACTIONS
39. How Contractions Differ
Informal
I can't attend the meeting.
Formal
I cannot attend the meeting.
Academic
The results cannot be considered conclusive.
Business
Unfortunately, I cannot attend the meeting. Could we reschedule it for Thursday?
PART VIII — PERSONAL PRONOUNS
40. Informal English
Personal pronouns are very common.
I think we should go.
41. Formal English
Personal pronouns may be used, but the tone is more restrained.
I would recommend that the matter be reviewed.
42. Academic English
First person depends on the discipline and assignment.
This study examines the relationship between...
Or:
I argue that the policy requires revision.
Both can be appropriate depending on the academic context.
43. Business English
"We" is extremely common because business communication often represents an organization.
We are pleased to announce...
We would appreciate your response.
PART IX — PASSIVE VOICE
44. Formal English
Passive voice can emphasize the action.
The application was approved.
45. Academic English
Passive voice is common when the process or result matters more than the researcher.
The samples were collected from three locations.
46. Business English
Active voice is often preferred for clarity and responsibility.
Passive
The report will be reviewed by the manager.
Active
The manager will review the report.
Business writing often favors the active version because it clearly identifies responsibility.
PART X — SENTENCE LENGTH
47. Informal
Short sentences are common.
I called him. He didn't answer. I'll try again later.
48. Formal
Sentences can be longer and more structured.
I attempted to contact him; however, I was unable to reach him.
49. Academic
Complex sentences are common when expressing relationships between ideas.
Although the sample size was relatively small, the findings provide useful evidence regarding the relationship between physical activity and academic performance.
50. Business
Business writing generally favors short to medium-length sentences.
The supplier has confirmed the delivery date. The order will arrive on Friday.
PART XI — EMOTIONAL LANGUAGE
51. Informal
I'm really excited about the trip!
Natural.
52. Formal
I am very pleased to announce the successful completion of the project.
53. Academic
Avoid unnecessary emotional language.
❌ This is an absolutely amazing discovery!
Better:
This finding is particularly significant.
54. Business
Positive language is appropriate when useful.
We are pleased to announce the successful launch of our new service.
PART XII — DIRECTNESS
55. Informal
Can you help me?
Very direct and natural.
56. Formal
Could you please assist me with this matter?
57. Academic
Further analysis may be required to address this issue.
58. Business
Please review the attached document and provide your feedback by Friday.
Business writing is often polite but direct.
PART XIII — FORMALITY SCALE
Think of English style as a spectrum:
Very informal
Hey! Can you send me that thing?
↓
Informal
Can you send me the file?
↓
Neutral
Could you send me the file?
↓
Professional/Formal
Could you please send me the document?
↓
Highly formal
I would appreciate it if you could provide the requested document at your earliest convenience.
↓
Academic
Please provide the document to facilitate further analysis.
But remember:
Academic does not automatically mean more formal than business writing.
Academic writing is different because it emphasizes evidence, analysis, and cautious claims.
PART XIV — WHEN TO USE EACH STYLE
59. Use Informal English When:
Talking to friends
Chatting with family
Sending casual messages
Posting casually on social media
Talking to people you know well
Example
Hey, are you free tonight? Let's grab dinner.
60. Use Formal English When:
Writing an official letter
Making a formal complaint
Writing to an authority
Making an official request
Writing a formal application
Example
I am writing to request further information regarding the application process.
61. Use Academic English When:
Writing an essay
Answering an academic question
Writing a research paper
Writing a thesis
Analyzing data
Discussing research
Example
The findings indicate that regular physical activity may contribute to improved academic performance.
62. Use Business Writing When:
Writing to customers
Communicating with suppliers
Writing to managers
Sending work emails
Preparing proposals
Writing reports
Requesting action
Discussing deadlines
Communicating business results
Example
Please review the attached proposal and provide your feedback by Friday.
PART XV — A VERY IMPORTANT DIFFERENCE
63. Formal ≠ Academic ≠ Business
These three are often confused.
Formal English
Focus:
Respect and professionalism
Academic English
Focus:
Evidence and analysis
Business Writing
Focus:
Action and results
Informal English
Focus:
Relationship and natural communication
A useful memory formula is:
Informal → Relationship
Formal → Respect
Academic → Evidence
Business → Action
PART XVI — SAME IDEA, FOUR STYLES
Consider this idea:
A project is late because there was a problem with the supplier.
Informal
The project is late because the supplier had a problem.
Formal
The project has been delayed due to an issue with the supplier.
Academic
The delay in project completion may be attributed to difficulties encountered by the supplier.
Business
The project is currently delayed due to a supplier issue. We expect to receive the materials by Friday and will provide a revised completion date thereafter.
Notice that the business version focuses on:
Current situation
Cause
Expected action
Next step
PART XVII — BUSINESS WRITING VS ACADEMIC WRITING
This is one of the most important distinctions.
| Academic Writing | Business Writing |
|---|---|
| Explains/analyzes | Informs/decides/acts |
| Evidence-centered | Action-centered |
| Often cautious | Often direct |
| Longer analysis | Usually concise |
| Citations often required | Citations only when relevant |
| Research terminology | Business terminology |
| Objective | Professional and practical |
| "The findings suggest..." | "We recommend..." |
| "This study examines..." | "The company will..." |
| "Further research is required..." | "The next step is..." |
Academic
The findings suggest that increased training may improve employee performance.
Business
We recommend additional training to improve employee performance.
PART XVIII — FORMAL VS BUSINESS WRITING
Formal writing can sometimes be too formal for modern business.
Highly formal
We hereby wish to inform you that your request has been received and is currently under consideration.
Better business writing
We have received your request and are currently reviewing it.
The second version is:
Professional
Clear
Concise
Natural
This is an important principle:
Good business writing is professional, not unnecessarily complicated.
PART XIX — ACADEMIC VS FORMAL WRITING
Academic writing is a form of formal writing, but it has additional requirements.
Formal
The new policy has produced significant changes.
Academic
The findings indicate that the new policy has produced significant changes in employment patterns.
Academic writing asks:
What is the evidence?
Formal writing mainly asks:
Is this appropriate and respectful?
PART XX — COMMON MISTAKES
64. Using Informal English in Academic Writing
❌ A lot of kids get stressed out because of exams.
✅ Many students experience stress as a result of academic examinations.
65. Using Academic Language in a Friendly Message
❌ Dear John, I wish to inform you that I intend to attend your birthday celebration.
Better:
Hey John! I'm looking forward to your birthday party!
66. Using Extremely Formal Language in Business
❌ We hereby request that you kindly furnish us with the aforementioned documentation.
Better:
Please send us the requested documents.
67. Using Slang in Business
❌ The new product is really cool and will make us a ton of money.
Better:
The new product has strong market potential and is expected to increase revenue.
PART XXI — STYLE TRANSFORMATION PRACTICE
68. Sentence 1
Basic idea:
We need more information.
Informal
We need some more information.
Formal
We require additional information.
Academic
Further information is required to support the analysis.
Business
Please provide the additional information by Friday.
69. Sentence 2
Basic idea:
The sales are going down.
Informal
Sales are going down.
Formal
Sales are declining.
Academic
The data indicate a decline in sales.
Business
Sales declined by 8% in July.
70. Sentence 3
Basic idea:
We need to fix the problem.
Informal
We need to fix this.
Formal
We need to resolve this issue.
Academic
Further investigation is required to address the underlying problem.
Business
We need to identify the root cause and implement a solution.
PART XXII — FORMALITY CHECKLIST
Before choosing a style, ask:
Audience
Who will read this?
Do I know them personally?
Are they a customer, teacher, manager, colleague, or friend?
Purpose
Am I chatting?
Am I requesting?
Am I analyzing?
Am I reporting?
Am I persuading?
Am I asking someone to take action?
Style
Is slang appropriate?
Are contractions appropriate?
Should I use technical terms?
Should I provide evidence?
Should I be cautious?
Should I give a clear action or deadline?
PART XXIII — MASTER COMPARISON
| Feature | Informal | Formal | Academic | Business |
|---|---|---|---|---|
| Audience | Friends/family | Officials/professionals | Academic readers | Business stakeholders |
| Purpose | Communicate socially | Communicate respectfully | Analyze/explain | Achieve a practical goal |
| Tone | Friendly | Serious | Objective | Professional |
| Vocabulary | Everyday | Formal | Precise/technical | Professional/industry-specific |
| Slang | Possible | No | No | No |
| Contractions | Common | Limited | Usually avoided | Usually limited |
| Phrasal verbs | Common | Less common | Selectively used | Selectively used |
| First person | Common | Possible | Discipline-dependent | Common |
| Passive voice | Less common | Moderate | Common when appropriate | Selective |
| Hedging | Low | Moderate | High | Moderate |
| Evidence | Rarely needed | Sometimes | Essential | Relevant |
| Citations | No | Usually no | Usually yes when sources are used | Usually no, unless needed |
| Sentence length | Short/simple | Moderate | Often complex | Short/moderate |
| Emotional language | Common | Limited | Limited | Controlled |
| Directness | Natural | Polite | Analytical | Clear/action-oriented |
| Main priority | Connection | Respect | Knowledge | Results |
PART XXIV — A Simple Learning Framework
If you are learning English grammar from basic to advanced, you can think of these styles as four stages of using grammar appropriately:
Level 1 — Informal English
Learn to communicate naturally:
I don't know.
Can you help me?
What are you doing?
Level 2 — Formal English
Learn to communicate respectfully:
I do not know.
Could you please assist me?
Could you please explain what you are doing?
Level 3 — Academic English
Learn to communicate analytically:
The available evidence does not provide sufficient information to determine the cause.
Level 4 — Business Writing
Learn to communicate professionally and achieve results:
We do not yet have sufficient information to determine the cause. Please provide the relevant data so that we can complete the investigation.
71. Final Rules to Remember
Informal English
Sound natural and friendly.
Formal English
Sound respectful and professional.
Academic English
Sound objective, precise, logical, and evidence-based.
Business Writing
Sound professional, concise, clear, and action-oriented.
72. The Most Important Principle
Do not think:
"Formal = better English."
Instead, think:
"Appropriate = better English."
A sentence can be grammatically correct but inappropriate for the situation.
For example:
Yo, what's up?
Grammatically and conversationally natural, but inappropriate for a university research paper.
And:
I hereby wish to inform you of my intention to attend the aforementioned event.
Grammatically correct and highly formal, but unnecessarily complicated when writing to a close friend.
The best English user can change style according to audience, purpose, and situation.
The four styles in one sentence:
Informal English builds relationships; Formal English shows respect; Academic English communicates evidence and analysis; Business Writing communicates information, decisions, and actions efficiently.
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