动词 ing，具有名词的性质和功能，叫做动名词。动名词可做主语、宾语和表语。
Swimming makes you healthy.
swimming做主语
My job is teaching children.
teaching 做表语
I love playing sports.
playing 就是宾语的一部分。
常用的动名词作宾语的动词还有：
- finish doing sth.
- enjoy doing sth.
- mind doing sth.
- stop doing sth.
- remember doing sth.
- like doing sth.
- love doing sth.
- hate doing sth.
- try doing sth.
- forget doing sth.
通常用于描述人或事物本身的特性用现在分词（-ing），过去分词（-ed）通常表达人的感受。
That is a interesting book.
那是一本有趣的书。（这里的 interesting 做定于）
This film is boring.
乏味的电影。（boring 作表语）
She likes playing basketball.
在这个句子中，playing 作为宾语，属于名词性用法，所以是动名词。
She is playing basketball.
这里的 playing 作为谓语，是现在分词。
难点现在分词相当于形容词，可以做表语；动名词相当于名词，也可以作表语。
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