Răspuns:
1. Alex practiced for three months before the concert.
2. The girls studied for their exams since Easter.
3. By six o' clock everyone went home.
4. Carrie finished the work before her boss returned.
5. Cathy's puppy died by the time she got it to the vet.
6. Mark wrote for six years before his work was published.
7. After my dad drove for 2 hours, we stopped for a break.
8. Everyone finished eating by the time Mr and Mrs Jones arrived.
9. She already got up by 7 o'clock when her alarm clock went off.
10. Tom waited for a phone call since he returned from school.
