Use for or since.

Решение:

1. I've been a teacher since 1990.
2. She waited for a long time but nobody came.
3. Grandma has been very happy for two months ago, she moved in with us two months ago.
4. I have lived in this town for three years.
5. Mary has known Paul since they were in High School together.
6. Correct the mistakes.
7. She didn't finish her homework yet.
8. Sue has knew Tom for a long time.
9. Where's Bill? - He just left.
10. Eva given me a present last week.
11. The postman hasn't given me the letter already.
12. Lisa already ate dinner.