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 

1. He left the college 3 years ago.
2.Did Shakespeare write a lot of play ?
3. We had a lovely meal with some friends yesterday.
4. When and where did you born ?