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The Paragraph: Writing a Topic Sentence

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B1 (Intermediate)Writing

The Paragraph: Writing a Topic Sentence

A paragraph is a group of sentences about one main idea. Every strong paragraph begins with a topic sentence — the sentence that tells the reader what the whole paragraph is about. Learning to write a clear topic sentence is the first and most important step in paragraph writing.

A paragraph is a group of sentences about one main idea. Every strong paragraph begins with a topic sentence — the sentence that tells the reader what the whole paragraph is about. Learning to write a clear topic sentence is the first and most important step in paragraph writing.

1. What a topic sentence does

A topic sentence has two jobs: it introduces the topic, and it controls what the rest of the paragraph can talk about. It is usually the first sentence.

Topic sentence The paragraph will talk about…
My city has many beautiful parks. the parks (not the food, weather, or people)
Learning English has three main benefits. the three benefits

2. A topic sentence is not a plan

A common mistake is to announce your plan instead of stating your topic. Avoid “announcement” openers.

Weak (announcement) Strong (real topic sentence)
I want to tell you about my city. My city is a wonderful place to live.
This paragraph is about football. Football is the most popular sport in the world.

3. Not too general, not too narrow

A good topic sentence is general enough to cover the whole paragraph, but focused enough to control it.

  • Too general: Cairo is a city. (says almost nothing)
  • Too narrow: Cairo has a museum on Tahrir Square. (only one fact)
  • Just right: Cairo is a city full of history.
The controlling ideaThe part of the topic sentence that limits the paragraph is called the controlling idea. In “My city has many beautiful parks,” the controlling idea is parks — every other sentence must be about the parks.
Tutor tip for Arabic speakersIn much Arabic writing, the main idea can appear later, after some introduction. English is more direct: put your main idea first, in sentence one. Before you write a paragraph, finish this sentence in your head: “This paragraph is about ___ and specifically ___.” The first blank is your topic; the second is your controlling idea. That single sentence becomes your topic sentence — just remove “This paragraph is about.”

Examples from EduCareer

  • Aisha wrote: “Reading every day improved my English quickly.” (topic + controlling idea)
  • Omar wrote: “My hometown is famous for its friendly people.”
  • Yusuf wrote: “There are three good reasons to study online.”
Common mistakes

I will write about my school.  →  My school is a friendly and modern place.

This paragraph is about food.  →  Egyptian food is delicious and varied.

My city. (a fragment, not a sentence)  →  My city is famous for its old markets.

Check your understanding

Answer the questions below. You will see instantly if you are right.

1.What is a topic sentence?
It introduces the main idea of the paragraph.
2.Where is the topic sentence usually placed?
Usually the first sentence.
3.What are the two jobs of a topic sentence?
It introduces the topic and controls what follows.
4.Which is a real topic sentence (not an announcement)?
It states the topic directly, not the plan.
5.What is wrong with "This paragraph is about football"?
It announces rather than states the idea.
6.Which is TOO general?
"Cairo is a city" says almost nothing.
7.Which is TOO narrow for a paragraph?
One tiny fact cannot fill a paragraph.
8.The controlling idea in "My city has many beautiful parks" is:
"parks" limits the paragraph to parks.
9.A paragraph is:
Sentences about ONE main idea.
10.Fix: "I will write about my school."
State the topic directly.
11.Which is the best topic sentence?
Clear topic + controlling idea (delicious and varied).
12.If your topic sentence is "Learning English has three benefits," the paragraph must discuss:
The controlling idea is "three benefits".
13.Which opener should you AVOID?
"Let me tell you..." announces instead of stating.
14."My city." is not a topic sentence because:
It has no verb; it is a fragment.
15.Which controlling idea best fits a full paragraph?
It is broad enough to develop but still focused.
16.A good topic sentence should be:
Balanced: covers the paragraph but stays focused.
17.Which is a strong topic sentence?
Clear topic with a controlling idea (three reasons).
18.What should every other sentence in the paragraph do?
They all support the topic sentence.
19.Turn this into a topic sentence: (topic: my job / idea: rewarding)
Topic (my job) + controlling idea (difficult but rewarding).
20.Best first sentence for a paragraph about a city\u2019s history:
General enough + focused on history.

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