Exercitiul 2:
1. did you go
2. are eating
3. have you been living
4. saw
5. haven't done
Exercitiul 3:
1. I have already packed all my things.
2. Have you organized your trip yet?
3. We have just come back from our summer holiday.
4. Dad hasn't arranged the flights yet.
5. Michael has already taken a lot of photos.
