Ответ:

2. Chris has been learning Japanese for four years.

3. She has been working hard all day.

4. Tom has been playing baseball since he was 15.

5. We have been living in Munich for years.

6. She has been cleaning the apartment all day.

7. They have been waiting for you since 2 p.m.

8. It has been snowing since Monday.

9. They have been standing here for an hour.