EX4:
1. My father hasn't played any sport since last year. ( Vì từ " since " là dấu hiệu của thì hiện tại hoàn thành )
2.Some people are attending the meeting right now. ( Vì từ " now " là thì hiện tại tiếp diễn)
3. I'd better have a shower. I haven't had one since Thursday.( Vì có từ " since ")
4. I don't live with my family now and we haven't seen each other for five years.
5. Where is your mother? She is having dinner in the kitchen.
6. Why are all these people here? What is happening?
7. I have just realized that there are only four weeks to the end of term.
8. She has finished reading two book this week.
9. At present, he is composing a piece of music.
10. We are having dinner in a restaurant right now.
