B1:
1. He left university three years ago.
2. Did Shakespeare write a lot of plays?
3. We had a lovely meal with some friends yesterday.
4. Where/ When were you born?
B2:
1. has => had
2. gave => give
3. Were => Did
4. When arrived the bus? => When did the bus arrive?
5. Did you were => Were you
6. smoking => smoke
7. stop => stopped
8. returns => returned
9. do => did
10. looked => look
B3:
1. live
2. didn't
3. walked
4. was
5. to do
6. work
B4:
1. does
2. didn't go
3. weren't
4. bought
5. were - lived
6. don't study
7. circles
