* Drill

sai câu:

5. arrived/were watching (thì quá khứ tiếp diễn)

6. were collecting (thiếu)

7. has been (có từ for mà bạn ;-;)

8. didnt want/waited (đằng trước đúng rồi)

9. was doing

13. walked

* Pasive voice

1. This house was ... (thì quá khứ bị động mà)

9. His letter was gotten (by me) this morning

* Indirect speech

4. can chuyển thành could

5. arrived , were watching

6.collected

8. don't want , am waiting

9. viet sai chu already nha ban :" alreadly"

11. was doing

13. walked

bai 2 

cau 6: reuse cua ban chua chia thi nha:"reuse"->"reused"

cau 7: speak cua ban viet sai thi nha;"speaken???"->"spoken"

cau 8: sai-> the classroom window has been broken by the boy.

cau 9: sai-> this letter was gotten this morning.

bai 3: 

cau 3: can -> could nha ban