English Grammar Lab

← C2

Cohesion and parallel structures

You will be able to Create coherent discourse through controlled substitution, ellipsis and parallelism.

Explanation

Parallel structures clarify relationships between ideas, while ellipsis prevents unnecessary repetition.

Examples

Detailed course

Understand the grammar point

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Detailed explanation

This lesson focuses on cohesion and parallel structures. The structure helps learners manage viewpoint and discourse structure, and it should always be interpreted as part of a complete message rather than as an isolated formula. Before selecting a form, identify the subject, time reference, clause relationship, and the information that receives emphasis.

Formation is central. Coordinate elements with comparable grammatical form and scope, and use pronouns, demonstratives, substitution, lexical repetition, and controlled synonyms to maintain clear reference across a text. Build the sentence in stages: identify the grammatical subject, choose the auxiliary or main verb form, and complete the clause in normal English word order. In negatives and questions, check whether the structure supplies its own auxiliary or requires another one.

The pattern can help users calibrate commitment and interpersonal distance, package dense information precisely, and adapt grammar to register and rhetorical purpose. These purposes may overlap, so context decides which interpretation is natural. Time expressions, determiners, linking words, and punctuation often provide evidence for the correct choice.

A useful contrast prevents overgeneralisation. Mechanical repetition is not the same as cohesion, and superficial parallelism can conceal differences in meaning or grammatical function. Ask how the nearest alternative would change time, certainty, focus, politeness, or register. A grammatically possible sentence may still communicate the wrong relationship if that contrast is ignored.

The guided examples are complete messages. Notice how the target structure agrees with its subject and how the surrounding vocabulary makes the intended meaning clear. When producing a new example, preserve the relationship between form and meaning while changing the people, place, and lexical details.

A reliable self-check is to paraphrase the sentence in simpler language. If the paraphrase changes the time relationship, degree of certainty, or focus, review the original form. Compare the sentence with the common mistakes and explain why the corrected version is preferable.

In connected speech and writing, the structure also contributes to cohesion. It guides the reader through background information, main events, causes, qualifications, and results. Clause order and connector choice can therefore affect interpretation even when every individual word is correct.

Register matters as well. A complex construction may be appropriate in a report but unnecessarily heavy in conversation, while an informal alternative may be too vague for academic writing. Choose the form because it serves the communicative purpose, not because it merely sounds advanced.

At an advanced level, apparent exceptions often reflect viewpoint and discourse organisation rather than a broken rule. Writers can manipulate ordering, modality, reference, or clause type to signal distance, caution, contrast, and evaluation. The safest analysis starts with the semantic relationship and then checks whether the syntax expresses it without ambiguity.

During editing, identify every pronoun and implied subject, verify the scope of negatives and modifiers, and check that parallel elements have the same grammatical function. If a shorter construction communicates the same nuance more clearly, prefer the clearer option.

Expert control also includes the alternatives deliberately rejected. A shift from active to passive, from finite clause to noun phrase, or from direct assertion to modalised claim redistributes agency and evidential responsibility. Accuracy at this level therefore includes rhetorical judgement and sensitivity to the reader’s processing load. Expert grammar involves selecting among alternatives that distribute agency, salience, certainty, and processing load differently. The sentence must be evaluated inside its paragraph, not only as an isolated pattern. A simpler paraphrase is a useful diagnostic when a dense construction becomes difficult to interpret. Expert grammar involves selecting among alternatives that distribute agency, salience, certainty, and processing load differently.

How to form it

Coordinate elements with comparable grammatical form and scope, and use pronouns, demonstratives, substitution, lexical repetition, and controlled synonyms to maintain clear reference across a text.

Use the structure to manage viewpoint and discourse structure.

Use the structure to calibrate commitment and interpersonal distance.

Use the structure to package dense information precisely.

Use the structure to adapt grammar to register and rhetorical purpose.

Mechanical repetition is not the same as cohesion, and superficial parallelism can conceal differences in meaning or grammatical function.

Guided examples

The policy aimed to reduce delays, improve transparency, and strengthen public oversight.

Three parallel to-infinitive phrases, reduce, improve, and strengthen, keep the coordinated list balanced.

The first study examined access in rural areas; the second did so in large cities.

Did so substitutes for examined access, avoiding repetition while keeping the parallel structure clear.

Some participants questioned the cost, others the timetable, and a few the underlying assumptions.

The repeated verb questioned is omitted after the first clause, keeping the three parallel objects economical.

What the proposal promises is greater consistency; what it lacks is a credible implementation plan.

Two parallel wh-clefts, what ... promises and what ... lacks, balance a strength against a weakness.

The evidence was incomplete, the definitions were unstable, and the conclusions were consequently provisional.

Three parallel clauses with was/were keep the sentence's structure balanced across its three claims.

This limitation affects not only the interpretation of the results but also their value for future policy.

Not only ... but also links two parallel noun phrases, keeping the coordinated structure balanced.

Common mistakes

Not: The policy aimed to reduce delays, improving transparency, and strengthen public oversight.

Use: The policy aimed to reduce delays, improve transparency, and strengthen public oversight.

All three coordinated verbs should share the same form after aimed to: reduce, improve, strengthen, not a mix with improving.

Not: The first study examined access in rural areas; the second did it in large cities.

Use: The first study examined access in rural areas; the second did so in large cities.

Did so is the standard substitute for a repeated verb phrase like examined access; did it does not work the same way here.

Not: Some participants questioned the cost, others questioning the timetable, and a few the underlying assumptions.

Use: Some participants questioned the cost, others the timetable, and a few the underlying assumptions.

The omitted verb after others and a few should match the first clause's plain form, questioned, not a mismatched form like questioning.

Not: What the proposal promises is greater consistency; what it lacks are a credible implementation plan.

Use: What the proposal promises is greater consistency; what it lacks is a credible implementation plan.

Plan is singular, so the second cleft needs is, not are.

Before you practise

  • Identify the communicative purpose.
  • Check the subject and required verb or auxiliary.
  • Confirm the time reference and clause order.
  • Compare the sentence with the nearest alternative.
  • Read the complete sentence and verify the meaning.

Reading text

Rebuilding a Fragmented Argument

About 652 words

A doctoral student, an adviser, and two peer reviewers worked at a university writing clinic to repair a chapter with weak links between claims. The case mattered because the draft jumps between ideas without enough structure. Across the table were policy aims, assumptions, criticisms, and research questions, and none of them could be treated as a neutral detail. The revised chapter compares not only the policy's aims but also its assumptions. The report did more than record a fact; it placed one decision inside a wider chain of responsibility. Each paragraph begins with a claim, develops that claim, and returns to the research question. The reviewers compared the public record with private notes, not to dramatise the dispute but to locate the point at which interpretation had begun to drift. The adviser replaced vague links with repeated key terms. At that stage, precision mattered more than speed, since a careless phrase could make a cautious finding sound like an accusation. Parallel phrasing made the three criticisms easier to evaluate. The discussion returned several times to audience, timing, and the burden carried by apparently small wording choices. One draft made the problem look technical; another made it look political; the final version had to acknowledge both without confusing them. By the close of the review, the result was clear: parallel phrasing gives the argument a clearer shape. A doctoral student, an adviser, and two peer reviewers return to policy aims, assumptions, criticisms, and research questions because each item helps with the task. The notes show why the draft jumps between ideas without enough structure. The group checks the time, the place, and the next decision before moving on. No one rushes, because a small error would change the outcome. The work stays connected to a university writing clinic, where the problem first became visible. By the end, the result is clear: parallel phrasing gives the argument a clearer shape. Later, the written record helps the group explain the decision without adding new claims. The strongest clue comes from the materials, not from anyone's memory alone. Several details point in different directions, so the group keeps the conclusion careful. The final record can be checked again if the question returns. A doctoral student, an adviser, and two peer reviewers return to policy aims, assumptions, criticisms, and research questions because each item helps with the task. The notes show why the draft jumps between ideas without enough structure. The group checks the time, the place, and the next decision before moving on. No one rushes, because a small error would change the outcome. The work stays connected to a university writing clinic, where the problem first became visible. By the end, the result is clear: parallel phrasing gives the argument a clearer shape. Later, the written record helps the group explain the decision without adding new claims. The strongest clue comes from the materials, not from anyone's memory alone. Several details point in different directions, so the group keeps the conclusion careful. The final record can be checked again if the question returns. A doctoral student, an adviser, and two peer reviewers return to policy aims, assumptions, criticisms, and research questions because each item helps with the task. The notes show why the draft jumps between ideas without enough structure. The group checks the time, the place, and the next decision before moving on. No one rushes, because a small error would change the outcome. The work stays connected to a university writing clinic, where the problem first became visible. By the end, the result is clear: parallel phrasing gives the argument a clearer shape. Later, the written record helps the group explain the decision without adding new claims. The strongest clue comes from the materials, not from anyone's memory alone. Several details point in different directions, so the group keeps the conclusion careful. The final record can be checked again if the question returns.

Reading comprehension

  1. Who is involved in the reading?

    Show answer

    a doctoral student, an adviser, and two peer reviewers

  2. Where does the reading take place?

    Show answer

    a university writing clinic

  3. What task are the people trying to complete?

    Show answer

    repair a chapter with weak links between claims

  4. What problem makes the task less simple?

    Show answer

    the draft jumps between ideas without enough structure

  5. How does the reading end?

    Show answer

    parallel phrasing gives the argument a clearer shape

Grammar in the text

  1. The revised chapter compares not only the policy's aims but also its assumptions.

    Not only ... but also links two parallel noun phrases, aims and assumptions.

  2. Each paragraph begins with a claim, develops that claim, and returns to the research question.

    Three parallel verbs, begins, develops, and returns, keep the description of the paragraph's structure balanced.

  3. The adviser replaced vague links with repeated key terms.

    Repeated key terms illustrates lexical cohesion rather than grammatical parallelism.

  4. Parallel phrasing made the three criticisms easier to evaluate.

    This sentence names the technique, parallel phrasing, that the earlier examples demonstrate.

Key point

Use this pattern when the meaning needs it in the reading: repeated structures and balanced phrasing. In short, cohesion and parallelism help complex arguments stay connected. Example: "The revised chapter compares not only the policy's aims but also its assumptions."

Practice

  1. Complete the sentence from the same situation: "The revised chapter compares not only the policy's aims but also ____ assumptions."

    Show answer

    The revised chapter compares not only the policy's aims but also its assumptions.

  2. Complete the sentence from the same situation: "Each paragraph begins with a claim, develops ____ claim, and returns to the research question."

    Show answer

    Each paragraph begins with a claim, develops that claim, and returns to the research question.

  3. Complete the sentence from the same situation: "The adviser ____ vague links with repeated key terms."

    Show answer

    The adviser replaced vague links with repeated key terms.

  4. Complete the sentence from the same situation: "Parallel phrasing ____ the three criticisms easier to evaluate."

    Show answer

    Parallel phrasing made the three criticisms easier to evaluate.

Listening practice

Watch a TEDx talk

“10 ways to have a better conversation” — Celeste Headlee (TED). Listen for clear, natural English and pick up new vocabulary while you review this grammar point.

Check your understanding

Which of these is one of Celeste Headlee's rules for a better conversation?

Check your understanding

What does Headlee say is the single most important skill for having a good conversation?

Practice

Choose the correct answer. Choose the sentence with correct parallelism.

Practice

Choose the correct answer. The first explanation was accepted, but the second ___.

Practice

Choose the correct answer. What matters is not whether the change is popular, but whether it ___.

Written practice

Produce the answer yourself. Capitalisation and final punctuation do not affect validation, but the grammar and word order must be correct.

Short answer

Written practice

Complete the sentence using "prioritises", "reducing waste" and "improving safety": The programme ______ across all sites during the first phase.

The programme ______ across all sites during the first phase.