Bài 1.
1. Who were your students (Dấu hiệu: The beginners)
2. What did you teach them (Dấu hiệu: We taught them...)
3. How about evening classes for adults (Dấu hiệu: also taught adults)
4. How long is each class (Dấu hiệu: 2 hours)
5. What were the evening classes like
Bài 2. (Đề bài yêu cầu tất cả đều chia thì hiện tại hoàn thành)
1. I have bought a laptop but I haven't used it.
2. I have written a blog but I haven't uploaded any photos to it.
3. We started the game half an hour ago but we haven't finished it. (vế chứa "ago" chia thì quá khứ đơn)
4. My dad has been to London but he hasn't seen Big Ben.
5. I have read my English book but I haven't done my English homework.
6. They have had lunch but they haven't had dinner.
7. I have downloaded some songs but I haven't listened to them.