1.They don't write to their mother once a month.
Do they write to their mother once a month?
Yes,they do.No,they don't.
2.Dave won't come to China in 2009.
Will Dave come to China in 2009?
Yes,he will.No,he won't.
3.Ther were not very poor then.
Were they very poor then?
Yes,they were.No,they were not.
4.They aren't going to buy you a beautiful toy car.
Are they going to buy you a beautiful toy car?
Yes,they are.No,they aren't.
5.Mary and Tom didn't come to school yesterday morning.
Did Mary and Tom come to school yesterday morning?
Yes,they did.No,they didn't
6.They didn't come back last week.
Did they come back last week?
Yes,they did.No,they didn't.