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4a

1. She's bought a new jacket.
2. He hasn't found a job yet.
3. Have you spoken to Mr. Jackson?
4. We have found a fantastic hotel.
5. They haven't finished eating.
6. Have you seen Peter this morning?
7. Have you done your homework this week?
8. We haven't replied to Mr.Jones's email yet.

4b

1. I've just had breakfast.
2. Have you finished your homework yet?
3. The film has already started.
4. I haven't met his girlfriend yet.
5. They have just got married.
6. You're too late. He's already gone home.
7. Have you spoken to him yet?
8. I haven't read his new book yet.