2.They haven't come yet
3.Tim has already invited Shirley in his party
4. John and Julie have had their home about two years
5. She hasn't taken her driving test yet
6.Mary has been a translator sice she left university
7.Have you ridden your new car yet?
8.Has Paul ever met a famous person?
EX12
1.yet
2.has worked
3.has worked
4.founded
5.not been
6.has given up
7.Have you read
8.haven't found
9.have lied