1.
We didn't study a very hard lesson yesterday.
Did you study a very hard lesson yesterday?
2.
We haven't studied almost every lesson in this book so far.
Have you studied almost every lesson in this book so far?
3.
Bản thân câu nào đã là câu PĐ rồi mà?
Have you watched that television program?
4.
My wife and I haven't traveled by air many times in the past.
Have your wife and you traveled by air many times in the past?
5.
I haven't read that novel by...
Have you read that novel by...?
6.
I didn't have a little trouble with my car last week.
Did you have a little trouble with my car last week?
7.
I haven't had any trouble with my car since then.
Have you had trouble with my car since then?
8.
He didn't watch an interesting program on television at night.
Did he watch an interesting program on television at night?
9.
I haven't seen an elephant several times.
Have you seen an elephant several times?
10.
Petter didn't play football yesterday.
Did Petter play football yesterday?