1.

1.We have collected used books and clothes for street children

--> Thì HTHT

2.He finds doing community service interesting

--> S + finds + n + adj

3.He was lazy , so he didn't pass the exam

--> Thì QKĐ

4.It is important to study English

--> Đằng sau động từ tobe là 1 tính từ

2.

1.Because of her sickness , she couldn't go to school yesterday

--> Thì QKĐ , Đặc điểm nhận dạng : yesterday

2.I haven't seen him for 3 years 

--> Thì HTHT , Đặc điểm nhận dạng : for

3.I think making pottery is interesting

--> S + think + n + be + adj

4.My sister enjoys reading comics 

--> Enjoy + V-ing

`#  TCV`