Topic sentence

In practice

A topic sentence states the main point of a paragraph. It is usually the first sentence, and it tells the reader what the rest of the paragraph will prove, explain or describe. In an essay, each topic sentence is a small claim that supports the thesis, so reading only the topic sentences in order should give you a fair outline of the whole argument.

A good topic sentence is a claim, not a fact or a quotation. "Gatsby throws large parties" is a fact the reader can check in a second. "Gatsby's parties are built for one guest who never comes" is a point the paragraph has to earn with evidence and explanation. The sentences after it carry that evidence, and a closing sentence ties it back to the thesis.

Topic sentences also do the work of transitions. A first sentence that links back ("Even his library is staged") tells the reader how this paragraph connects to the one before it, so the essay reads as one argument moving forward rather than a stack of separate points.

A topic sentence rescued in a writing center

Marcus opened with a statistic, so the reader had to guess what it was for. Ana's note moves his point to the front. The new topic sentence makes a claim the forty lanes and the crash numbers can now support, and it connects back to an essay arguing for more of them.

Topic sentence examples for different essays

Argumentative essay, thesis: "Cities should replace parking minimums with protected bike lanes." Topic sentences: "Protected lanes cut crashes for drivers and pedestrians as well as cyclists." "Parking minimums raise the rent of every new apartment, whether its tenants own a car or not." "The businesses that feared losing parking usually gain customers instead." Each one is a reason, and each could be its own paragraph.

Literary analysis, thesis about Macbeth: "In the first act, Macbeth hesitates until his wife questions his courage." "Even the witches only predict; it is Macbeth who decides what their words mean." Each topic sentence names a moment in the play and the point it proves, so the quotations that follow have a job.

Narrative or descriptive paragraph: "My grandmother's kitchen was the only room in the house where nobody was allowed to be sad." Even outside an argument, the topic sentence sets the controlling impression that every detail in the paragraph should build.

How to write a topic sentence

Write the paragraph's point in plain words before you write anything else: "this paragraph shows that…". Then cut the scaffolding and keep the claim. If you cannot finish the sentence, you probably have evidence without a point yet, so look at your quotation or statistic and ask what it proves.

Connect it to the thesis. Use one key word from your thesis or a clear reason that serves it, so the reader sees which part of the argument this paragraph carries. Then add a transition if the paragraph turns or builds: "Even more telling…", "The cost is not only financial…".

Keep it narrow enough for one paragraph. A topic sentence that could support a whole essay ("Climate change affects everything") will produce a paragraph that wanders. Narrow it to one cause, one example or one stage of the argument, and save the rest for the next paragraph.

Common topic sentence mistakes

Starting with a quotation or a statistic. Evidence is strongest after the claim it supports. If a paragraph opens with "According to a 2021 study…", the reader does not yet know why the study matters. Move the point to the front and let the study prove it.

Starting with plot summary. In a literary essay, "In chapter three, Nick goes to a party" retells; it does not argue. Ask what the party shows and write that instead. Summary can follow in a clause, but the sentence should end on your claim.

Writing an announcement. "In this paragraph I will talk about bike lanes" tells the reader what you plan to do. A topic sentence does it: it states the point outright, so the reader can start weighing it.

The same habit in scenes and pitches

Scenes have an equivalent: the moment that tells the audience what this scene is about. A screenwriter who opens a scene on its turn, the line or image that sets its question, works the way a topic sentence does. If you cannot say what a scene is for in one sentence, it may be two scenes, or none.

Pitches and treatments use topic sentences literally. Each paragraph of a treatment or a pitch document opens with the beat it covers, so an executive who skims only first lines still follows the story. Drafting that outline first, one sentence per paragraph, is the fastest way to find the gaps in it.