You will learn
- Say what a topic sentence is.
- Find the topic sentence.
- Write a topic sentence.
- Match a topic sentence to details.
Version 0.2 · expanded edition · built from cited public sources Content is based on the official frameworks and sources listed under Sources and standards. No official endorsement is claimed. Written in the style of common primary school assessments. No exam result is promised.
Student lesson
- A paragraph is about one main idea.
- The topic sentence tells the main idea.
- It is usually the first sentence.
- Details follow.
Words to know
a group of sentences about one idea
the sentence that tells the main idea
what the paragraph is mostly about
start a little to the right
1. Discover: My school
I love my school. My teacher is kind. My friends play with me. The library has many books. We learn new things every day.
Think: Which sentence tells the main idea?
2. Understand: Topic sentences
Idea 1: One idea
A paragraph is a group of sentences about one idea. Start it with an indent or a new line.
Idea 2: Topic sentence
The topic sentence tells the main idea, usually first: I love my school.
Idea 3: Details follow
The other sentences are details: kind teacher, friends, books, learning.
3. Worked examples
Example 1 (I show you): Find
Find the topic sentence: I love my school. My teacher is kind.
- Main idea.
Answer: I love my school.
Example 2 (We do it together): Write
Write a topic sentence about your pet.
- Main idea.
Answer: I have a pet cat.
Example 3 (You try): Match
Which topic sentence fits: dogs bark, run and guard?
Show the steps and answer
- Big idea.
Answer: Dogs are useful pets.
Did you know?
Many news articles begin with a topic sentence.
Why this matters
A good topic sentence helps readers know what to expect.
4. Explore: Topic sentence
Write topic sentences.
- Choose a topic.
- Write the main idea.
- Add details.
- Check they match.
Think about it: what did you notice?
You can write topic sentences.
5. Practise
Say it in a sentence
Use these starters when you talk about the lesson. Say them out loud.
- My topic sentence is ___.
- The main idea is ___.
- The details are ___.
- This fits because ___.
Guided practice
Question 1. What is a topic sentence?
the sentence with the main idea
Question 2. Where does it go?
first
Question 3. Write one about school.
I love my school.
Independent practice
Level 1: Start
- A group of sentences about one idea is a ___.
- The main idea sentence is the ___ sentence.
- It is usually the ___ sentence.
- The rest are ___.
- We ___ a paragraph.
Level 2: Grow
- Write a topic sentence about animals.
- Which is a topic sentence: I like football?
- Find the topic: Cats purr. Cats are great pets. Cats sleep a lot.
Level 3: Stretch
- Why a topic sentence?
- Does it need details?
- Can it come first?
Answers are in the answer key below. Try first, then check.
6. Apply: English in everyday life
Write three topic sentences.
Show a sample answer
three sentences
Another one. Write a paragraph with a topic sentence.
Show a sample answer
a paragraph
7. Common mistakes
Fix: Start with one.
Fix: Stay on one idea.
8. Lesson summary and revision card
- I can say what a topic sentence is.
- I can find it.
- I can write one.
- I can match details.
9. Check and master
Answer all 14 questions. You will see feedback after each one.
Your result appears here after you answer every question.
10. Key takeaways
- A paragraph has one idea.
- The topic sentence tells it.
- It usually comes first.
- Details follow.
11. Next lesson
Next lesson: Supporting details. Keep going with the next idea in this course.
Exam practice
These questions are written in the style of common school and international primary assessments. Try them on your own, without looking back. Then check your answers in the marking guide. The marks are shown in brackets.
- What is a topic sentence? [1 mark]
- Where does it usually go? [1 mark]
- Write a topic sentence about your pet. [1 mark]
- What follows the topic sentence? [1 mark]
- Explain how to write a paragraph beginning. [3 marks]
Total: 7 marks.
Marking guide and model answers
- the sentence that tells the main idea [1]
- first [1]
- valid [1]
- details [1]
- choose one idea [1]; write a topic sentence [1]; add details [1]
Score guide: 6 to 7 = secure. 5 to 5 = nearly there, revise the parts you missed. Under 5 = work through the lesson again with a grown-up.
Printable worksheet
- A group of sentences about one idea is a ___.
- The main idea sentence is the ___ sentence.
- It usually comes ___.
- The rest are ___.
- We ___ a paragraph.
- True or false: a paragraph has one idea.
- True or false: the topic sentence is a detail.
- Write a topic sentence.
- Find the topic: Cats purr. Cats are great pets.
- Write a topic sentence about animals.
Homework
Write three topic sentences.
Answer key and marking scheme
| Question | Expected response | Marks |
|---|---|---|
| 1. A group of sentences about one idea is a ___. | paragraph | 1 |
| 2. The main idea sentence is the ___ sentence. | topic | 1 |
| 3. It usually comes ___. | first | 1 |
| 4. The rest are ___. | details | 1 |
| 5. We ___ a paragraph. | indent | 1 |
| 6. True or false: a paragraph has one idea. | true | 1 |
| 7. True or false: the topic sentence is a detail. | false | 1 |
| 8. Write a topic sentence. | I love my school. | 1 |
| 9. Find the topic: Cats purr. Cats are great pets. | Cats are great pets. | 1 |
| 10. Write a topic sentence about animals. | Animals are amazing. | 1 |
| Total | 10 |
Independent practice answers. Level 1: 1 paragraph; 2 topic; 3 first; 4 details; 5 indent. Level 2: 1 Animals are amazing.; 2 yes; 3 Cats are great pets.. Level 3: 1 tell the main idea; 2 yes; 3 yes.
Quiz answers: 1 B, 2 C, 3 A, 4 B, 5 C, 6 A, 7 B, 8 C, 9 A, 10 B, 11 C, 12 A, Challenge 1 B, Challenge 2 C.
Mastery and remediation
| Objective | Bronze (Developing) | Silver (Proficient) | Gold (Advanced) |
|---|---|---|---|
| O1 Say what a topic sentence is | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O2 Find the topic sentence | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O3 Write a topic sentence | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
| O4 Match a topic sentence to details | Shows this with help from an adult or a picture | Does this independently and explains how they know | Explains it clearly and uses it in a new situation |
Courseversity badge thresholds (overall quiz score): Gold = 90–100%; Silver = 80–89.9%; Bronze = 70–79.9%. A badge is never a full record of progress.
If a learner struggles
- Find the misconception: No topic sentence. Start with one.
- Explain another way: use real objects, pictures or actions first, then words.
- Show a simpler example: Use topic sentence frames.
- Guided practice: work through one example together and let the learner try the next one.
- Reassess: use the quiz again or the worksheet.
- Move on when the learner shows Silver-level evidence independently.
For parents and guardians
In this lesson your child writes topic sentences. You do not need to be an expert to help.
- Read their sentences.
- Ask: What is the main idea?
- Praise focus.
- Ask “how do you know?” after each answer, and listen.
- Praise effort, not only right answers. Mistakes are how we learn.
- Ten to fifteen minutes a day is better than one long session.
Teacher package
1–5. Objectives, prerequisites, materials, preparation, duration
Lesson objectives. Learners will: say what a topic sentence is; find the topic sentence; write a topic sentence; match a topic sentence to details.
Prerequisite knowledge. Combining sentences.
Materials. Chart paper or board, pencils, picture or word cards, a reading book if available. Low-resource options: use chalk or charcoal on a board or wall, drawings in the sand, and objects from the classroom instead of printed materials.
Preparation. Write the key words and examples on the board or on cards before the lesson.
Suggested duration. 45–60 minutes. It can be split into two shorter sessions.
6–9. Teaching procedure, explanation notes, guided and independent activities
Introduction (5 min). Review sentences.
Explanation (10 min). Teach topic sentences.
Guided activity (10 min). Practise.
Independent activity (10 min). Check.
Assessment and reflection (5 min). Ask each learner to say one thing they learned and how they know it.
Key questions. What is the main idea?
Teacher explanation notes. Move from the spoken word to pictures and then to print. Read aloud often, point to the words, and let learners hear and say before they read and write.
10–12. Differentiation, formative assessment, common misconceptions
Support. Use frames. Extension. Write paragraphs.
Formative assessment. Listen to learners read and explain, ask “how do you know?”, and check the independent work.
Misconceptions. No topic sentence. Start with one.
13–15. Assessment questions, answer keys, marking scheme
Use the quiz, the 7-mark exam practice and the worksheet on this page. All answers and marking guides are in the answer sections above. Re-check every answer before use.
16–19. Remediation, enrichment, homework, teacher reflection
Remediation. Use topic sentence frames. Enrichment. Write paragraphs. Homework. See above.
Teacher reflection. After teaching, record: which ideas learners understood; which misconceptions occurred; which activities worked; which learners need more practice; and what to improve next time.
Sources and standards
This lesson is based on the sources below, and no official endorsement is claimed. Reference starting points: Common Core State Standards for English Language Arts, Cambridge Primary and the IB Primary Years Programme. Where a standard code is named, it points to the official framework.
Official standards for this topic area. Common Core State Standards for English Language Arts (official site): Grade 2 » Writing; Grade 2 » Language. These pages list the standards that cover this topic area; read them alongside the lesson.
Research used to shape this lesson. Common Core W.2.2 (write informative/explanatory texts in which they introduce a topic) and W.2.5; Cambridge Primary English Stage 2 (writing). These sources informed the lesson.