非谓语动词的三种形式及用法区别？

非谓语动词是指不具有人称、数和时态等语法形式，不能单独作谓语，而只能作为其他动词、名词或形容词的补语、定语或状语的一类动词形式。非谓语动词通常有三种形式：动词不定式、动名词和现在分词。

1、动词不定式：动词不定式一般由“to 动词原形”构成。它可以作为主语、宾语、定语、表语、状语等。例如：

To learn English well is my goal. (作主语)

I want to eat some fruit. (作宾语)

He has a lot of books to read. (作定语)

My job is to teach English. (作表语)

He works hard to pass the exam. (作状语)

2、动名词：动名词一般由动词原形加上-ing构成。它可以作为主语、宾语、定语、表语、状语等。例如：

Swimming is good for health. (作主语)