Is there a bird in the tree?
Yes,there is.
No,there isn't.还有一句：TomandJerryarefriends.和上题一样Are Tom and Jerry friends?Yes, they are.No, they aren't.最后一句：Mybrotherisanurse.Myfatherlikesrunning.Iamastudent.Is your brother a nurse?Yes, he is.No, he isn't.Does your father like running?Yes, he does.No, he doesn't.Are you a student?