表示未完成的动作用to,表示已完成的动作或动作本身用ing 例:start to do sth(开始做某事), want to do sth (想要做某事), remember to do sth (记着去做某事), forget to do sth(忘记去做某事), intend to do sth (打算做某事); enjoy doing sth(喜欢做某事,强调事情本身) , remember doing sth(记得做过某事) , forget doing sth(忘记做过某事),imagine doing sth(想像着做某事,强调事情本身)
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