摘要：按句子的用途可分四种: 1)陈述句:He is six years old; She didn’t hear of you before. 2)疑问句:Do they like skating? How old is he? Is he six or seven years old? Mary can swim, can’t she? 3)祈使句:Be careful, boys; Don’t talk in class 4)感叹句:How clever the boy is!

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