Ex 1
1. Mike was a student.
Mike wasn't a student.
Was Mike a student?
2. Helen had a car.
Helen hadn't a car.
Had Helen a car?
3. You was a good friend.
You wasn't a good friend.
Was you a good friend?
4. You were good friends.
You weren't good friends.
Were you good friends?
5. It was difficult to remember everything.
It wasn't difficult to remember everything.
Was it difficult to remember everything?
Ex2.
1. was
2. did
3. had
4. went
5. took
Ex 3.
1. took
2. took
3. began
4. had
5. had