can't help do sth/can't help to do sth./can't help doing sth 有什么区别？

正确来说，
can't help do something: 不能帮忙做
can't help doing:忍不住...

以前一直以为can't help to do是正确句型，来到北美看了多少书写了多少文章才意识到can't help do才是对的。

不过如果要对国内的考试交待，还是国内怎么教的就怎么答吧。

can’t help to do sth = 不能帮助做某事can’t help doing sth = 禁不住做某事，情不自禁地做某事

ms没有can't help do sth这个结构啊

很好很全，我以前见过这问题。。

请看下面的试题：He knows nothing about it, so he can’t help _________ any of your work.
A. doing B. to do C. being doing D. to be done

【分析】此题答案应选B。比较以下结构：can’t help to do sth = 不能帮助做某事can’t help doing sth = 禁不住做某事，情不自禁地做某事请看例句：I can’t help to do it. 我不能帮忙做这事。He couldn’t help to wash the clothes. 我不能帮忙洗衣服。She couldn’t help smiling. 她禁不住笑了起来。She couldn’t help envying Helen. 她不由得 不妒忌海伦。We cannot help being impressed by their zeal. 我们不由得不被他们的热情感动。英语有时还可说can’t help somebody doing something不能使某人不做某事。如：I couldn’t help him saying that. 我不能让他不这样说。We couldn’t help them seeing us. 我们无法让他们不看