1：Maryworksinthepark .
Does Mary work in the park?
Yes, she does.
No. Mary doesn't work in the park.
2:Studentsgotoschool .
Do students go to schoo?
Yes, they do.
No. Students don't go to school.
3.Hesingswell .
Does he sing well?
Yes, he does.
No. He doesn't sing well.如果修改后，会更好。不过你是第一个回答的You are welcome.