有些动词既能直接带不定式又能直接加ing,有些只能用不定式,有些后面带的不定式跟ing形式意义不同,那么,动词ing形式

有些动词既能直接带不定式又能直接加ing,有些只能用不定式,有些后面带的不定式跟ing形式意义不同,那么,动词ing形式和动词不定式应该什么时候用?

1.可以接带to的动词不定式作宾语的动词主要有：要求选择同意(ask,choose,agree),期望决定学习(expect,hope,decide,learn),宁可假装知道(prefer,pretend,know),希望想要愿意(wish,want,would like / love).如：
1)We decided to talk to some students about why they go there.
2)He prefers to eat white bread and rice.
3)Id love to visit Mexico.
2.动词decide,know,learn,show,teach,tell...,介词结构on...可用疑问词带to的不定式短语作宾语,但why后面的不定式不带to.如：
1)Could you please tell me where to park my car?
2)It gives advice on what to do in lots of different situations.
3.动词feel,find,make,think等后面,可以用it作形式宾语代替真正的宾语——动词不定式,句子结构是...feel / find / make / ...it+adj./ n.+to do.如：
I find it difficult to remember everything.
4.既可接动词不定式又可接ving形式作宾语,意思差别不太大的动词有begin,start,like,love等.一般说来,动词不定式表一次、数次的具体动作、将来动作或动作的全过程,ving形式表习惯性的连续动作.但是这种区别并不很严格,特别是美国英语,即使是习惯性的动作也可以用动词不定式.如：
1)Then I started to watch English-language TV.
2)I’m beginning to understand my Chinese roots,and who I am.
begin用了进行时态,后面只接不定式作宾语,表示事情刚开始,还要继续下去.
3)I like to eat vegetables.
感知动词like,love,know等一般不用进行时态.
5.后接动词不定式或ving形式作宾语,意思差别较大的动词有forget,remember等.后接不定式作宾语,表动作尚未发生；后接ving形式作宾语,表动作已经发生.stop to do停下来做另外一件事,to do是目的状语；stop doing停止做、不做当前这件事,doing是宾语.try to do尽力做,try doing试试看；go on to do接着做另外的事,go on doing继续做原来的事.
6.动词hear,see,feel,watch,notice,look at,listen to等后面的动词不定式作宾语补足语时不能带to,即常见的形式为:hear sb do sth等
Many people like to watch others play games.许多人喜欢看别人玩游戏.
7.let,make,have后面的动词不定式作宾语补足语,也不能带to; help后面的动词不定式作宾语补足语,to可有可无
She let us meet her at the station,but she didn’t come.她让我们去车站迎接她,卡她没有来.
8.这两种情况下的动词不定式在改被动语态句子时,必须将省略的to还原,也就是说,动词后需跟带to的动词不定式.
We heard him sing every day.
He was heard to sing every day.那时每天都听到他唱歌.