be动词后面为什么加动词ing形式

Answer 1

be动词后加 动词 ing形式 除了表示进行时，还能表示其他内容

具体如下：

1.be doing 表现在进行时,正在做某事。

例句：Tom is playing football now.

2.be doing 也可以表示一般将来时,指最近将要发生某事。

例句：The old man is dying.老人快要死了。

3.be doing 后接always等表示频率性副词，常表达说话人的某种情绪如赞扬、不满、责备等

4.be doing 形式 表示动作正在进行,但是有时也可以表示将来或者打算.

比如：I am visiting my grandma tomorrow.

扩展资料：

可以加doing的动词：

mind,escape,practise,enjoy,finish,miss,consider,stand,suggest,keep

imagine,fancy,mention,admit,avoid,delay,dislike,deny,risk,appreciate,recommend

resist,resume,forgive,report，include,excuse,understand,complete,endure,prevent,recall

advise(但advice sb to do),allow(但allow sb to do),permit(但permit sb to do),forbid(但forbid sb to do) 

可以加doing的短语：

1.不包括明显介词结尾的词组

keep on,insist on,feel like,give up,put off,burst out,set about,be worth,can’t help,be busy,have difficulty/trouble (in) 

2.明显介词结尾的词组：

dream of/about,think of,think about,succeed in,be afraid of,be good at,be interested in，thank somebody for,excuse for,apologize to sb for,be tired of,be fond of

be sure of,what (how) about,a way of,have the idea of,can’t do something without,in hopes/the hope of,with/for the purpose of

3.含介词to接doing的动词词组 

object to,be/get used to,look forward to,be devoted to,devote oneself to,come close to,pay attention to,get down to

be reduced to(被迫、沦落到……的地步),take to(变得喜欢、开始经常),fall to(开始)

lead to,be opposed to,come to(接近,差一点),refer to,agree to(同意某个观点),be on the way to(就要……)