1、動名詞。例:Swimming is good for health.
2、現在進行時。例:I am doing my homework.
3、動詞并列。例:She stood here,reading a book.
4、動詞前有部分介詞。例:She is looking forward to seeing him.
5、有些動詞加ing變為形容詞。例 :exhaust加ing為exhausting,此時詞性由動詞變為形容詞。
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