$III$.

$1$. playing

$2$. happiest

$3$. took

$4$. reading

$5$. didn't go / was

$6$. Have - sung

$7$. play / played

$8$. were

$9$. has never eaten

$10$. Did - start

$11$. Has - biten

          has biten

$12$. took

$13$. to remember

Học tốt~

1. Playing

Có từ "enjoy" nên đằng sau là V_ing

2. Happy person

Trước N là 1 adj

3. Took

Có từ "ago" ở QKĐ

4. Reading

Có "be fond of" nên thêm V_ing

Lưu ý thêm cho bn: "be fond of = be interested in = be keen on = like: thích"

5. Didn't go ; was

Có "yesterday" chia ở QKĐ

6. Have you ever sung ...?

có "ever" chia ở HTHT

7. Play (có "often" chia ở HTĐ)

Played (có "last" chia ở QKĐ)

8. Were

Có "yesterday" chia ở QKĐ

9. Has never eaten

Có "never" chia ở HTHT

10. Did people start ...?

Có "ago" chia ở QKĐ

11. Has your dog ever bitten ...?

Yes, he has bitten ...

Có " ever" chia ở HTHT

12. Took

Có "would"

13. To remember

Đây là cấu trúc: S + tobe (not) + adj + to V + ... : Thật ... để ...

Study well