**Exercise 4: Write these sentences in affirmative, negative and interrogative forms of the Past simple**

1. (+) They decided to leave soon.  
   (-) They did not decide to leave soon.  
   (?) Did they decide to leave soon?

2. (+) There were many homeless people here ten years ago.  
   (-) There were not many homeless people here ten years ago.  
   (?) Were there many homeless people here ten years ago?

3. (+) Tom's grandfather worked in this hospital.  
   (-) Tom's grandfather did not work in this hospital.  
   (?) Did Tom's grandfather work in this hospital?

4. (+) My teacher started teaching here 6 years ago.  
   (-) My teacher did not start teaching here 6 years ago.  
   (?) Did my teacher start teaching here 6 years ago?

5. (+) Jane often went to school on foot 3 years ago.  
   (-) Jane did not often go to school on foot 3 years ago.  
   (?) Did Jane often go to school on foot 3 years ago?

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**Exercise 5: Underline the mistakes and correct them**

1. My friend and I **was** at the hairdresser's yesterday.  
   **Correction:** My friend and I **were** at the hairdresser's yesterday.

2. Did your father **worked** in a tobacco factory before he retired?  
   **Correction:** Did your father **work** in a tobacco factory before he retired?

3. Why **you didn't** come to the meeting last week?  
   **Correction:** Why **didn't you** come to the meeting last week?

4. Was Anna **be** successful with her project last week?  
   **Correction:** Was Anna **successful** with her project last week?

5. Yesterday morning I **readed** several chapters of the book "The little prince".  
   **Correction:** Yesterday morning I **read** several chapters of the book "The little prince".

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**Exercise 6: Complete the list. Use the words from the box.**

- sent
- had got
- did
- knew
- began
- flew
- brought
- took
- went
- wore
- drank
- ran
- came
- told
- gave
- stood
- met
- made
- found

**Past simple Verb:**
- send - sent
- have got - had got
- do - did
- know - knew
- begin - began
- fly - flew
- bring - brought
- take - took
- go - went
- wear - wore
- drink - drank
- run - ran
- come - came
- tell - told
- give - gave
- stand - stood
- meet - met
- make - made
- find - found

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**Giải thích:**
- Đối với Exercise 4, các câu được chuyển đổi từ dạng khẳng định sang phủ định và nghi vấn theo quy tắc của thì quá khứ đơn.
- Trong Exercise 5, các lỗi ngữ pháp được chỉ ra và sửa lại cho đúng theo quy tắc ngữ pháp tiếng Anh.
- Exercise 6 yêu cầu hoàn thành danh sách động từ ở dạng quá khứ, giúp củng cố kiến thức về các động từ bất quy tắc.