1. This is the first time I have ever read a romantic story
2. We have been cooking for the party for 4 hours
3. When did they buy the house?
4. We haven't decorated this room for years
5. It's 3 months since she last went to the hairdresser
6. It's the first time I have ever met a famous person
7. They haven't visited me for 5 years
8. The last time I went to Bristol was 3 years ago
9. Laurence last saw her sister when she left for Japan
10. The last time Lucy wore that dress was Barbara's wedding
11. We are going to be told about her family
12. Math has been learnt for 7 years
13. If they had a garden, they would grow vegetables
14. If I had had my mobile yesterday, I could have contacted you
15. Unless he studies hard, he will get bad result