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动词不定式的用法：

1.ask/tell/want/order/teach/wish/wouldlike/invite/encourage sb. to do sth.

2.ask/tell/want/order/teach/wish/wouldlike/invite/encourage sb. not to do sth.

3.Help...(to) dosth.

4.主系表 + 不定式(to do)

5.主系表 +for sb + 不定式(to do)

6.部分动词既可跟动名词又可跟不定式：(同动名词 6)

7.疑问词+不定式(to do)可以把复合句变为简单句，(to = 主语+will/would/can)