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问题: 句型转换

1.It's a book(划线提问)a book是
2.These are six buses(变否定句)
3.These are cakes (变一般疑问句,并做否定回答)
4.That is an apple(变一般疑问句并做肯定,否定回答)

解答:

1.What's this?
2.These are't six buses.
3.Are these cakes? ——No,there are't.
4.Is that an apple? ——Yes,it is. No,it isn't

参考文献:自己所学的