How to Write a Topic Sentence (With 15 Examples)

A topic sentence is the sentence that states the single main point of a paragraph, usually the first one. Write it by naming your subject, making a claim about it that the rest of the paragraph can prove, and keeping the scope narrow enough for one paragraph. Below are a formula, placement rules, 15 examples and a practice set.

What is a topic sentence?

A topic sentence states the main idea of one paragraph. Everything else in the paragraph, the evidence, examples and explanation, exists to support it. A reader who read only the topic sentences of an essay should be able to follow its argument from start to finish.

The thesis statement does the same job for the whole essay. If the thesis is the claim of the essay, each topic sentence is a smaller claim that proves one part of it. For the full picture, see our guides on how to write a thesis statement and how to write a paragraph.

A simple formula for a topic sentence

Most strong topic sentences have three parts:

1. Subject: what the paragraph is about.
2. Claim: what you say about it, an opinion, a cause, an effect or a comparison.
3. Scope: the limit that keeps the idea small enough to prove in one paragraph.

If you cannot name all three parts, the sentence is probably a topic label rather than a point. "Remote work" is a topic. "Remote work has changed the office" is a vague claim. The full sentence above is a point you can support with evidence.

Weak versus strong: announcing a topic or making a point

The most common mistake is writing a sentence that announces what the paragraph will do instead of saying something. Compare these pairs.

A strong topic sentence can be disagreed with. That is a good test: if nobody could argue with it, it is a fact or a label, and the paragraph has nothing to prove.

Where to put the topic sentence

In academic English the topic sentence usually comes first. The reader meets the point, then the proof. This is the default for school essays, university papers, reports and workplace writing.

• First sentence (default). Best for essays, reports and emails. Readers who skim still get your point.
• After a transition. In the body of an essay you may open with a short linking phrase ("In contrast," "A second reason is that") and then state the point. The topic sentence is still the first full statement.
• Last sentence. Occasionally a paragraph builds through examples and ends with the point. This can work in narrative or persuasive writing, but in exam essays it risks the marker missing your point.
• Implied. Some fiction and journalism leaves the main idea unstated. For essays that will be graded, state it.

When in doubt, put it first.

15 topic sentence examples

Argumentative essays

1. Universities should make attendance optional, because students who choose to attend participate more actively than those who are required to.
2. A national minimum wage that rises with local living costs protects low-paid workers better than a single fixed rate.
3. Banning single-use plastic bags changes shopping habits only when a small charge replaces the free alternative.

Analytical and literature essays

1. In Macbeth, the repeated image of blood shifts from a sign of heroism in Act 1 to a symbol of guilt by Act 5.
2. The opening chapter of The Great Gatsby establishes Nick as a narrator who claims neutrality but reveals strong judgments.
3. The poem's short, broken lines mirror the speaker's grief by refusing to resolve into smooth rhythm.

Cause-and-effect and expository essays

1. Rising rents have pushed many young professionals to share housing well into their thirties.
2. Sleep loss affects three areas of student performance: memory, attention and mood.
3. The internet changed retail by moving the first step of buying from the shop floor to the search bar.

Compare-and-contrast essays

1. Although both cities rely on tourism, Edinburgh's economy is far more diversified than Venice's.
2. Paper books and e-readers differ most in how they affect a reader's sense of place within a text.

Reports and workplace writing

1. Customer complaints fell in the third quarter, mainly because the support team moved to same-day replies.
2. The proposed software has two clear advantages for our team: lower cost and simpler training.

Narrative and descriptive essays

1. The summer I spent working at my uncle's market stall taught me that patience is a skill you build, not a trait you are born with.
2. The old railway station felt abandoned, but the details, a clock stopped at 4:10 and a bench still warm from the sun, suggested otherwise.

How to connect topic sentences to your thesis

Check each topic sentence against your thesis by asking one question: does this sentence prove part of my thesis? If not, either the paragraph is off topic or the thesis needs revising.

A quick method:

1. Write your thesis at the top of a page.
2. Under it, list only your topic sentences in order.
3. Read the list aloud. It should sound like a short version of your argument.
4. Delete or rewrite any sentence that repeats another or drifts away from the thesis.

The same list is an outline. If you are planning an essay, the Outline Generator can suggest a structure to start from, and you can then write your own topic sentences for each section.

Topic sentences and transitions

A topic sentence often does two jobs at once: it links back to the previous paragraph and points forward to its own.

• Weak: "Another factor is cost."
• Stronger: "Beyond distance, cost is the factor that most often decides where students study."

The stronger version nods to the earlier point (distance) and then makes a clear claim. For more ways to link paragraphs, see our list of transition words. Avoid starting every paragraph with "Firstly," "Secondly" and "Finally" unless the assignment clearly asks for a numbered structure.

Common mistakes

• Too broad. "Technology is important in modern life." You cannot prove this in one paragraph. Narrow it: "Smartphones have replaced the paper diary for most office workers."
• Too narrow. "The report was 14 pages long." A fact with nothing to argue.
• Two ideas in one. If the sentence says "Exercise improves mood and rising prices hurt families," split it into two paragraphs.
• Announcing. "In this paragraph I will explain..." Delete the announcement and state the point.
• Starting with a quote or example. Evidence belongs after the topic sentence, not instead of it.
• Copying the thesis. Each topic sentence should add a new part of the argument, not restate the whole.

Topic sentence checklist

• Does it state one main idea?
• Does it make a claim someone could question?
• Is the scope narrow enough for a single paragraph?
• Does every other sentence in the paragraph support it?
• Does it connect to the thesis and to the paragraph before?
• Is it clear on its own, without needing the sentences that follow?

Practice set

Rewrite each weak sentence as a strong topic sentence. Possible answers follow.

1. Weak: "Fast food is a topic many people discuss."
2. Weak: "There are many problems with homework."
3. Weak: "This paragraph looks at climate change."
4. Weak: "Teachers are important."

Possible rewrites:

1. Fast food remains popular among students mainly because it is cheaper and quicker than cooking at home.
2. Heavy homework loads reduce the time students have for sleep, which in turn lowers their results.
3. Climate change is already raising flood risk in low-lying coastal towns.
4. A good teacher improves learning most by giving specific feedback, not by simply explaining the material.

Your answers will differ, and that is fine. What matters is that each one names a subject, makes a claim and stays small enough to prove.

Using AdeptWrite tools to practice

AdeptWrite tools can help you draft and tidy, but the point of the paragraph has to be yours.

• Paste a paragraph into the Grammar Checker to catch errors after you have fixed the structure.
• If a topic sentence reads stiffly, try the Sentence Rewriter and compare the versions with your own.
• The Paragraph Generator can produce a sample body paragraph from a main idea you type in. Treat the output as a draft to rewrite, and follow your institution's rules on AI assistance.

All tools handle up to 6,000 characters per run. AI output can be wrong or generic, so read it critically.

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