1. He goes to the swimming pool because he likes swimming.

$-$ He went to the swimming pool because he liked swimming.

2. They have dinner at nine o'clock.

$-$ They had dinner at nine o'clock.

3. Helen eats too many sweets.

$-$ Helen ate too many sweets.

4. I buy the newspaper in the shop.

$-$ I bought the newspaper in the shop.

5. We get up at eight o'clock and go to school

$-$ We got up at eight o'clock and went to school.

6. Does she buy the newspaper in the shop over there? 

$-$ Did she buy the newspaper in the shop over there? 

7. Do they do their homework in the evening? 

$-$ Did they do their homework in the evening? 

8. Do they have a good holiday? 

$-$ Did they have a good holiday? 

9. Do they find any animal in the forest? 

$-$ Did they find any animal in the forest? 

10. Is it dark when she gets up in the morning? 

$-$ Was it dark when she gots up in the morning? 

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$×$ Cấu trúc thì quá khứ đơn:

$+$ Với động từ thường: S + V2/ed.

$+$ Với tobe: S + was/were (+not) + V(nguyên mẫu).

$+$ Với trợ động từ: S + did (+not) + V(nguyên mẫu).

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$@haanx2$