Grammar - Parallel Structures
Parallel Structures in English – Complete Explanation
1. What Is a Parallel Structure?
Parallel structure, also called parallelism, means using the same grammatical form for words, phrases, or clauses that have the same function in a sentence.
The basic idea is:
Equal ideas should have equal grammatical forms.
Incorrect
She likes reading, to swim, and cycling.
The forms are different:
reading → -ing
to swim → infinitive
cycling → -ing
Correct
She likes reading, swimming, and cycling.
All three use -ing forms.
2. Why Is Parallel Structure Important?
Parallel structure makes English:
Clearer
More balanced
Easier to read
More natural
More elegant
More persuasive
It is especially important in:
Academic writing
Essays
Reports
Presentations
Business writing
Formal speeches
Lists
Comparisons
3. The Basic Rule
When two or more elements are connected, try to use the same grammatical structure.
Noun + Noun
I need a pen and a pencil.
Adjective + Adjective
She is intelligent and hardworking.
Verb + Verb
He studies and works.
-ing + -ing
She enjoys reading and writing.
Infinitive + Infinitive
I want to study and to travel.
Part I: Parallel Nouns
4. Noun + Noun + Noun
When listing nouns, keep them as nouns.
Correct
The course covers grammar, vocabulary, and pronunciation.
Incorrect
The course covers grammar, vocabulary, and speaking English fluently.
The third element is a phrase rather than a simple noun.
A more balanced version:
The course covers grammar, vocabulary, and pronunciation.
5. Parallel Adjectives
Use adjectives in a series.
Correct
She is kind, intelligent, and hardworking.
Incorrect
She is kind, intelligent, and works hard.
The first two are adjectives, but the last is a verb phrase.
6. Parallel Adverbs
Correct
He spoke clearly, confidently, and politely.
All three are adverbs.
Incorrect
He spoke clearly, with confidence, and politely.
This is not necessarily grammatically wrong, but it is less parallel.
Better:
He spoke clearly, confidently, and politely.
Part II: Parallel Verbs
7. Simple Verb Forms
Correct
She reads, writes, and teaches English.
All three verbs have the same grammatical form.
Incorrect
She reads, writing, and teaches English.
8. Gerunds in a List
If one activity is expressed with an -ing form, the others should normally use the same form.
Correct
He enjoys reading, writing, and drawing.
Incorrect
He enjoys reading, writing, and to draw.
9. Infinitives in a List
You can use several infinitives.
Correct
I want to study, to travel, and to work abroad.
It is also possible to omit repeated to when the structure is clear:
I want to study, travel, and work abroad.
Both are grammatical.
10. Participles
Correct
The job requires planning, organizing, and managing.
All three use -ing forms.
Part III: Parallel Phrases
11. Prepositional Phrases
Keep similar phrases in the same form.
Correct
She works in the morning, in the afternoon, and in the evening.
You can sometimes omit repeated prepositions:
She works in the morning, afternoon, and evening.
12. Infinitive Phrases
Correct
My goals are to improve my English, to develop my skills, and to find a better job.
13. -ing Phrases
Correct
My hobbies are reading books, watching movies, and listening to music.
Part IV: Parallel Clauses
14. Independent Clauses
Parallel clauses should have similar structures.
Correct
She studies hard, and she works hard.
Better and more concise
She studies hard and works hard.
15. Complete Clauses
Correct
The teacher explained the lesson, the students asked questions, and the teacher answered them.
The three ideas have similar clause structures.
Part V: Parallel Structure with Coordinating Conjunctions
The most common coordinating conjunctions are:
for, and, nor, but, or, yet, so
A useful memory word is FANBOYS.
16. And
Correct
She likes reading and writing.
Incorrect
She likes reading and to write.
17. Or
Correct
You can walk or take a bus.
Both are base verbs.
18. But
Correct
He is intelligent but careless.
Both are adjectives.
19. Yet
Correct
The task was difficult yet interesting.
Both are adjectives.
Part VI: Correlative Conjunctions
20. What Are Correlative Conjunctions?
These are pairs of words that work together.
Important pairs include:
both...and
either...or
neither...nor
not only...but also
whether...or
rather...than
The elements connected by these pairs should be parallel.
21. Both...and
Correct
She is both intelligent and hardworking.
Both connected elements are adjectives.
Incorrect
She is both intelligent and works hard.
Another Example
He both studies and works.
22. Either...or
Correct
You can either stay home or go out.
Incorrect
You can either stay home or going out.
With Nouns
You can choose either tea or coffee.
23. Neither...nor
Correct
She neither smokes nor drinks.
With Nouns
Neither John nor Mary was available.
24. Not Only...But Also
This is one of the most important parallel structures.
Correct
She is not only intelligent but also hardworking.
Incorrect
She is not only intelligent but also works hard.
Better:
She is not only intelligent but also hardworking.
Or:
She not only studies hard but also works hard.
25. Whether...Or
Correct
I don't know whether to stay or to leave.
Both are infinitives.
You can also say:
I don't know whether to stay or leave.
26. Rather Than
Keep the structures balanced.
Correct
I prefer walking rather than driving.
Another
She chose to stay rather than to leave.
Part VII: Parallel Comparisons
27. Comparisons with "Than"
When comparing two things, keep the structures parallel.
Correct
She likes reading more than watching television.
Incorrect
She likes reading more than to watch television.
28. As...As
Correct
He is as intelligent as his brother.
With clauses
She works as hard as her sister does.
29. The More..., the More...
This is an important parallel structure.
Pattern
The + comparative..., the + comparative...
Examples:
The more you practice, the better you become.
The harder you work, the more successful you will be.
The earlier you start, the sooner you finish.
Part VIII: Parallel Structure in Lists
30. Three or More Items
Every item in a list should ideally have the same grammatical form.
Incorrect
The course teaches students to read, writing, and speaking.
Correct
The course teaches students to read, to write, and to speak.
Or:
The course teaches students reading, writing, and speaking.
The important point is consistency.
31. Parallel Structure in Goals
Incorrect
My goals are improving my English, to get a better job, and traveling abroad.
Correct
My goals are improving my English, getting a better job, and traveling abroad.
32. Parallel Structure in Instructions
Incorrect
To succeed, you should study hard, attending classes, and practice regularly.
Correct
To succeed, you should study hard, attend classes, and practice regularly.
Part IX: Parallel Structure with "There Are"
Correct
There are three things we need: time, money, and patience.
All three are nouns.
33. Parallel Structure After "Such As"
Correct
Outdoor activities such as walking, swimming, and cycling are good for your health.
Part X: Parallel Structure in Academic Writing
34. Parallel Lists in Essays
Weak
The study examines how students learn, their motivation, and whether they attend classes regularly.
The structures are different.
Better
The study examines how students learn, how they stay motivated, and how regularly they attend classes.
Now the structures are balanced.
35. Parallel Structure in Thesis Statements
Weak
This essay discusses the causes of climate change, how it affects people, and solutions.
Better
This essay discusses the causes of climate change, its effects on people, and possible solutions.
The three elements are noun phrases.
Part XI: Parallel Structure in Business English
36. Business Example
Weak
Our company aims to increase sales, improving customer service, and reduce costs.
Correct
Our company aims to increase sales, improve customer service, and reduce costs.
37. Job Descriptions
Correct
The position requires employees to communicate effectively, solve problems, and work collaboratively.
All three are base verbs.
Part XII: Parallel Structure with "From...To"
38. From...To
The two elements should be logically parallel.
Correct
The course covers topics from basic grammar to advanced writing.
Incorrect
The course covers topics from learning grammar to advanced writing skills.
Better:
The course covers topics from basic grammar to advanced writing.
39. From...Through
Examples:
The program is available from Monday through Friday.
The course progresses from basic concepts through advanced applications.
Part XIII: Parallel Structure with "Not"
40. Not...But
Correct
The problem is not the cost but the quality.
Both are noun phrases.
Another Example
She is not angry but disappointed.
Both are adjectives.
41. Not...But Rather
Correct
He is not lazy but rather inexperienced.
Part XIV: Parallel Structure with "The Same...As"
Correct
She has the same interests as her brother.
With actions
He studies in the same way as his classmates do.
Part XV: Parallel Structure and Subject–Verb Agreement
Parallel structure does not remove the need for correct subject–verb agreement.
Example
John and Mary are students.
The compound subject requires are.
42. Either...Or / Neither...Nor
With either...or and neither...nor, the verb generally agrees with the nearer subject.
Examples
Either John or Mary is coming.
Either Mary or the students are coming.
Neither the teacher nor the students are ready.
In formal writing, this rule is especially important when the subjects differ in number.
Part XVI: Faulty Parallelism
43. What Is Faulty Parallelism?
Faulty parallelism occurs when elements that should have the same grammatical structure are expressed differently.
Incorrect
She likes reading, to swim, and playing tennis.
Correct
She likes reading, swimming, and playing tennis.
44. More Examples of Faulty Parallelism
Example 1
❌ He likes to read, writing, and swimming.
✅ He likes reading, writing, and swimming.
Example 2
❌ She wants to study, traveling, and to work abroad.
✅ She wants to study, travel, and work abroad.
Example 3
❌ The job requires patience, being responsible, and communication skills.
Better:
The job requires patience, responsibility, and communication skills.
Part XVII: Parallelism vs. Repetition
45. Parallel Does Not Always Mean Identical
Parallel structure means that the grammatical forms are equivalent. They don't necessarily have to contain exactly the same words.
Example
She opened the door, walked inside, and sat down.
The verbs are different, but their grammatical form is parallel.
Part XVIII: Rhetorical Parallelism
46. Parallelism in Speeches
Parallelism is powerful in speeches because it creates rhythm and makes ideas memorable.
Example:
We must work together, learn together, and succeed together.
The repeated structure creates emphasis.
47. Parallelism in Writing
Example:
We need better schools, better hospitals, and better roads.
The repeated structure makes the sentence strong and memorable.
48. Parallelism with Repeated "We"
Example:
We will study. We will work. We will succeed.
This is a rhetorical form of parallelism.
49. Anaphora
Anaphora is the repetition of a word or phrase at the beginning of successive clauses or sentences.
Example:
We need better schools.
We need better hospitals.
We need better roads.
This combines repetition and parallel structure.
50. Antithesis
Antithesis places contrasting ideas in parallel structures.
Example:
Easy to say, difficult to do.
Another:
We must learn to live, not live to learn.
The balanced structures make the contrast stronger.
Part XIX: How to Correct Faulty Parallelism
51. Step 1 – Identify the Connected Elements
Look for:
and
or
but
both...and
either...or
neither...nor
not only...but also
than
as...as
52. Step 2 – Identify the First Form
Example:
She likes reading, writing, and to swim.
The first form is:
V-ing
53. Step 3 – Make the Others Match
Change:
to swim
to:
swimming
Final:
She likes reading, writing, and swimming.
54. Quick Transformation Examples
| Incorrect | Correct |
|---|---|
| reading, to write, swimming | reading, writing, swimming |
| to study, working, to travel | to study, to work, to travel |
| intelligent, hardworking, works well | intelligent, hardworking, efficient |
| both studying and to work | both studying and working |
| either to stay or leaving | either to stay or to leave |
| not only smart but also works hard | not only smart but also hardworking |
| likes reading more than to watch | likes reading more than watching |
55. Parallel Structure Checklist
When checking your writing, ask:
1. What is being connected?
Find the words or phrases connected by and, or, but, than, etc.
2. Do they have the same grammatical form?
For example:
reading + writing + swimming ✅
3. Are the verb forms consistent?
study + work + travel ✅
4. Are adjectives matched with adjectives?
intelligent + hardworking + creative ✅
5. Are nouns matched with nouns?
education + health + employment ✅
6. Are phrases matched with phrases?
to study English + to improve pronunciation + to develop vocabulary ✅
7. Are clauses balanced?
She studies hard + she works hard ✅
56. Master Summary Table
| Structure | Example |
|---|---|
| Noun + noun | books, pens, and pencils |
| Adjective + adjective | kind, intelligent, and patient |
| Verb + verb | reads, writes, and teaches |
| -ing + -ing | reading, writing, and speaking |
| Infinitive + infinitive | to study, to work, and to travel |
| Phrase + phrase | in the morning and in the evening |
| Clause + clause | She studies and she works |
| both...and | both intelligent and hardworking |
| either...or | either stay or leave |
| neither...nor | neither eats nor drinks |
| not only...but also | not only studies but also works |
| whether...or | whether to stay or leave |
| rather...than | walking rather than driving |
| the more...the more | the more you practice, the better you become |
| not...but | not the price but the quality |
| from...to | from basic to advanced |
57. Practice Questions
1. Choose the parallel sentence.
A. She likes reading, to swim, and dancing.
B. She likes reading, swimming, and dancing.
Answer: B
2. Correct the sentence.
He wants to study, working, and travel abroad.
Answer:
He wants to study, work, and travel abroad.
3. Correct the sentence.
She is not only intelligent but also works hard.
Answer:
She is not only intelligent but also hardworking.
OR:
She not only studies hard but also works hard.
4. Correct the sentence.
The job requires communication skills, being responsible, and patience.
Answer:
The job requires communication skills, responsibility, and patience.
5. Complete the parallel structure.
The more you practice, ______.
Answer:
the better you become.
58. Final Definition
Parallel structure is the use of the same or equivalent grammatical form for two or more ideas that are connected or compared.
Remember:
Noun + Noun + Noun
Adjective + Adjective + Adjective
Verb + Verb + Verb
-ing + -ing + -ing
Infinitive + Infinitive + Infinitive
Phrase + Phrase + Phrase
Clause + Clause + Clause
The simplest rule to remember is:
If ideas are equal in importance, make their grammatical structures equal.
Parallel structure is especially important for advanced English writing because it makes sentences clear, balanced, natural, and powerful.
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