1、动名词。例:Swimming is good for health.
2、现在进行时。例:I am doing my homework.
3、动词并列。例:She stood here,reading a book.
4、动词前有部分介词。例:She is looking forward to seeing him.
5、有些动词加ing变为形容词。例 :exhaust加ing为exhausting,此时词性由动词变为形容词。
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