1. 现在进行时，结构： be+doing.
例如：He is reading.
2.非谓语动词形式当中，现在分词表示主动。
例如： The girl standing there is my sister.
3.在非谓语动词形式中，现在分词可以做的除了谓语之外的其他成分。
例如：
作主语： leaving you is the most difficult choose I have to make.
作宾语： He went on doing homework after eating lunch.
作宾补： I found the book Interesting.
作定语： The girl standing there is my sister.
作状语： Working harder, you will be success.
作表语：The book is interesting.
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