Question

英语：动词开头的句子,什么时候用ing形式、什么时候用to 动词原形?？

Answer 1

不定式和动词ING做主语的区别：
A:
1、动名词做主语往往表示普通的、一般的行为,不定式做主语常表示某次具体的行为.例如：
Collecting information about children’s health is his job.收集有关儿童健康的信息是他的工作.
It’s necessary to discuss the problem with an experienced teacher.与一位有经验的老师讨论这个问题是有必要的.
2、常用不定式做主语的句型有：
（1）It’s difficult (important,necessary) for *** .to do
（2）It’s kind (good,friendly,polite,careless,rude,cruel,clever,foolish,brave) of *** .to do.
3、常用动名词做主语的句型有：
It’s no good (use,fun) doing.
It’s (a) waste of time one’s doing.
ps：“collecting the information about childrens health”只是暂时行为,又不是一直都在收集.,5,both are ok,2,都可以的。
比如说，Swimming is good for your health.
To swim is to build you good health.,2,随便啦，看个人喜好。但要注意无论哪一种，谓语要用单数。若动词不定式太长，最好用it作形式主语，将不定式放到句后，即 It is(was)… to do…看：
(To eat too much junk food every day) is bad for your health.可换为：
It is bad for your health (to eat too much junk...,1,ing 是习惯性的，to 是一次性的,0,