先看2个例句:

Being a League member, he is always helping others.

To be a League member, he is always helping others.

含义有什么区别呢?

精讲分析:

Being a League member, he is always helping others. 作为一名共青团员,他总是帮助其他人。(动词ing形式表状态,已经是一名团员了)

To be a League member, he is always helping others.为了成为一名共青团员,他总是帮助其他人。(不定式,表目的、将来。还不是团员,为了以后成为团员。)

知识拓展:对于非谓语动词,各家语法书众说纷纭。

一般可以把非谓语分成三部分:

动词不定式 to do 基本语法意义:表目的,表将来;

To pass next exam, he works hard. 为了通过下一场考试,他努力学习。

动词ing形式 V+ing 基本语法意义:表进行,表状态;

Singing a song, he walked into his classoom. 他【唱着歌】走进了他的教室。

He finished his homework, tiring but exciting. 他完成了他的家庭作业,疲惫并兴奋着。

动词的过去分词 基本语法意义:表过去,表被动。

Criticized by Tom, Bob went away. 被汤姆批评了一顿,鲍勃走了。

非谓语动词其他的用法大体可以分为三类:

与动词的固定搭配(平时注意积累)

stop to do; forget to do ;mean to do ;try to do ;devote to doing

stop doing ;forget doing ;mean doing; try doing ;look forward to doing

固定句式

It's time for sb to do sth.

主语+have nothing to do but do

习惯用法

Seeing is believing. 眼见为实。

动词不定式和现在分词的区别