Writing Cohesively: How Sentences Connect to Form a Text

Good writing is often described as writing that “flows.” Readers move easily from one sentence to the next, understand how ideas relate, and rarely have to stop to figure out what a pronoun refers to or why a new sentence has appeared. Much of this sense of flow comes from cohesion.

Cohesion is sometimes confused with coherence, but the two concepts are different. Coherence concerns whether a text makes sense as a whole. A coherent paragraph has a recognizable purpose, develops ideas logically, and provides information that readers can interpret as belonging together. Cohesion, in contrast, concerns the linguistic connections between parts of a text. Writers create cohesion through words and grammatical choices that connect one sentence, clause, or idea to another.

Consider the following example:

Maria bought a new laptop. The device was expensive, but she needed it for her classes. Because of this, she decided to work extra hours during the summer.

The sentences are connected in several ways. The device refers back to a new laptop. The pronouns she and it refer back to Maria and the device. The conjunction but establishes contrast, while because of this connects Maria’s decision with the situation described previously. These connections create cohesion.

Several types of cohesive devices are especially important in academic writing.

Reference

Reference occurs when a word directs readers to another element in the text. Pronouns are perhaps the most familiar examples.

Researchers interviewed 40 teachers. They were asked about their experiences using artificial intelligence.

The pronoun they refers back to 40 teachers. Demonstratives such as this, that, these, and those can perform a similar function.

Students frequently used AI to revise their drafts. This practice raised questions about authorship.

The phrase this practice summarizes information from the previous sentence and connects it to the new claim.

Writers must use reference carefully. A pronoun with an unclear antecedent can weaken cohesion rather than strengthen it.

The teacher discussed the assignment with the student after she finished the presentation.

Who finished the presentation—the teacher or the student? When readers cannot identify the referent easily, the cohesive link breaks down.

Lexical Cohesion

Cohesion is also created through vocabulary. Lexical cohesion occurs when related words appear throughout a text. Writers may repeat an important word, use a synonym, or choose vocabulary from the same semantic field.

The university introduced a new assessment policy. The policy requires instructors to explain how artificial intelligence may be used in assignments. These new assessment guidelines will be reviewed at the end of the semester.

Repeating policy helps maintain the topic, while assessment guidelines introduces controlled variation.

Beginning writers are sometimes told never to repeat words. This advice can be misleading. Strategic repetition is often useful because readers need stable vocabulary to track important concepts. Constantly replacing a key term with different synonyms may actually make a paragraph less cohesive.

Conjunction

Conjunctions explicitly show relationships between ideas. Words and phrases such as however, therefore, in addition, for example, because, although, and as a result tell readers how one proposition relates to another.

Compare these sentences:

The students received extensive feedback. Their second drafts improved considerably.

The relationship is understandable, but it is implicit.

The students received extensive feedback. As a result, their second drafts improved considerably.

The expression as a result makes the causal relationship explicit.

Transitions should not be added mechanically, however. A writer should first determine the relationship between ideas and then select an appropriate connector. Adding however does not create contrast if the sentences do not actually contrast with each other.

Substitution and Ellipsis

Writers can also create cohesion by avoiding unnecessary repetition through substitution and ellipsis.

Substitution replaces previously mentioned information with another word.

Some students preferred printed articles, while others preferred digital ones.

The word ones substitutes for articles.

Ellipsis occurs when information is omitted because readers can recover it from the surrounding text.

Some participants completed the survey online; others, in person.

The words completed the survey are omitted from the second clause because they are already understood.

Both techniques help writers connect ideas efficiently without repeating entire structures.

Information Flow

Cohesion also depends on how information moves from one sentence to the next. Effective writers frequently begin sentences with information readers already know and place newer information later.

Consider:

The researchers developed an online questionnaire. The questionnaire contained 25 items. These items focused on teachers’ attitudes toward generative AI.

Each sentence begins with information introduced previously. An online questionnaire becomes the questionnaire, which introduces 25 items. Those items then become these items in the following sentence.

This pattern creates a chain of information. Readers do not have to make large conceptual jumps because each sentence provides a bridge to the next one.

Compare this with:

The researchers developed an online questionnaire. Teachers’ attitudes toward generative AI were the focus of 25 items. Data collection lasted three weeks.

Each sentence may be grammatically correct, but the connections are less visible. The paragraph feels more fragmented because the writer has provided fewer linguistic signals showing how the ideas relate.

Cohesion Is More Than Adding Transition Words

A common misconception is that cohesive writing simply contains many transition words. Transitions certainly contribute to cohesion, but cohesion emerges from an entire network of relationships across a text. Pronouns point backward. Key vocabulary is repeated. Synonyms create lexical connections. Conjunctions signal logical relationships. Ellipsis removes predictable information. Sentence openings connect new statements with information readers already possess.

For this reason, writers should revise for cohesion by looking between sentences, not only within them.

After writing a paragraph, examine each sentence and ask: What connects this sentence to the previous one? Can readers identify what each pronoun refers to? Are important terms repeated consistently? Does a conjunction accurately express the relationship between ideas? Does the beginning of the sentence connect with information already introduced?

Cohesive writing leaves visible linguistic pathways for the reader to follow. A writer may know perfectly well how two ideas are connected, but readers cannot see what exists only in the writer’s mind. Cohesive devices make those relationships visible on the page.

When those connections are clear, individual sentences stop functioning as isolated statements and begin functioning as parts of a text.