陈述句(肯定、否定):He is six years old. She didn’t hear of you before.
2)疑问句(一般、特殊、选择、反意):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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