Question

can't help doing和can't help to do

Answer 1

can’t help to do sth 意思为“不能帮助做某事 ”
　　can’t help doing sth意思为“禁不住做某事,情不自禁地做某事 ”
　
例句：
　　1.I can’t help to do it.我不能帮忙做这事.
　　2.He couldn’t help to wash the clothes.我不能帮忙洗衣服.
　　3.She couldn’t help smiling.她禁不住笑了起来.
　　4.She couldn’t help envying Helen.她不由得不妒忌海伦.
　　5.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：
　　1.I couldn’t help him saying that.我不能让他不这样说.
　　2.We couldn’t help them seeing us.我们无法让他们不看到我们.
　　3.She could not help the tears of rage rolling down her face.她止不住她愤怒的眼泪顺着面颊流下来.

仅供参考