18.3 Answer the questions. Use the words in brackets () + for or ago.

1. When did she arrive in London? four days ago.
2. How long has she been in London? for four days.
3. How long have they been married? for 20 years.
4. When did they get married? 20 years ago.
5. When did Dan arrive? ten minutes ago.
6. When did you buy those shoes? two months ago.
7. How long has she been learning English? for two months.
8. How long have you known Jan? for a long time.
9. What time did you have lunch? an hour ago.