1.This house has been build since last month. A B C D 2. While I did my homework. I had a good idea. A B C D 3. The result of that test must be inform before August. A B C D 4. Somebody cleans the room everyday. --> The room 5. I have never stayed in such an expensive hotel before --> This is 6. The last time she came here was in 1999. --> She has not

Phương pháp làm:
1. Kiểm tra cấu trúc câu và thì của động từ.
2. Tìm lỗi và sửa chữa.
3. Đặt lại câu một cách chính xác.

Câu trả lời:
1. This house has been built since last month.
2. While I was doing my homework, I had a good idea.
3. The result of that test must be informed before August.
4. The room is cleaned everyday.
5. This is the most expensive hotel I have ever stayed in.
6. She has not come here since 1999.