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Writing skills · lesson 9 of 27 · free

Topic sentence — English writing skills for kids

A paragraph is a group of sentences about ONE topic. Its first sentence — the topic sentence — tells the reader the main idea. The other sentences give details about it.

▶ Watch how it works

Got it? Practise ↓

Writing tip

Main idea first — “the topic sentence says what the whole paragraph is about”

  1. Read the detail sentences and ask: what are they ALL about?
  2. The topic sentence names that main idea in one sentence.
  3. A sentence about a different topic cannot open the paragraph, however nice it sounds.

Use it for: Paragraph writing in every class, and the first line of every composition.

Worked example: Which sentence is the best opening (topic sentence) for this paragraph? → I got a new bicycle on my birthday.

  1. The paragraph: ___ It is red with a shiny silver bell. Its seat is soft and comfortable. I ride it to the park every evening.
  2. All the details are about a bicycle, so the best opening is: I got a new bicycle on my birthday.

Check: Every detail (bell, seat, riding to the park) fits “I got a new bicycle” ✓

▶ Watch it animated

✓ Written and checked by the TalentJR team · Updated 13 Oct 2026 · How we make our lessons

✏️ Practice

Read every choice carefully, then tap the one that is written correctly. Stuck? Press “Show me how”.

Right: 0 · Tried: 0

🏁 Lesson 9 test

20 questions. Check each answer, then go to the next one. Get 16 or more right to pass.

🏅 Sign in with Google to earn the 🎯 Topic Sentence Pro badge when you pass — and a certificate when you finish all 8 lessons of Part 2 · Paragraphs and stories. You can still take the test without signing in.

🖨️ Topic Sentence Worksheet

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