1. have tried...haven't succeeded
2. has read...have you read
3. have been waiting....has forgetten
4. rested...was
5. has studied...hasn't got
6. is going...has never been
7. lived...have just decided
8. has been lying....Haven't you read it yet?
9. hasn't been...has lived
10. has lost...has looked....haven't turned up
11. has worked...didn't have
12. Have you swum (HTHT diễn tả hành động xảy ra trong quá khứ nhưng để lại kết quả ở hiện tại - tóc bị ướt)
13. has driven
14. Have you worked
15. has been ringing....haven't answered