№4.

2) He has been playing tennis since 5:00 pm.

3) It has been snowing for three hours.

4) I haven't seen Susan since 2001.

5) Bill and Richard have been taking karate lessons since March.

6) I have been waiting for a friend outside the cinema for twenty minutes.

7) Tina has been going on holiday to Sanatorini for five years.

8) I haven't seen David for ages.

№5.

1) am writing

2) has happened

3) Do you know...

4) has asked

5) have been waiting

6) have been reading

7) have aalready written

8) want

9) am counting

10) attend

11) am becoming

12) Are you not excited...

№6.

1) have been learning

2) have been

3) hasn't been to

4) hasn't taken

5) have ever been to