help后面是加to do还是 doing 举些例子啊~

问题描述:

help后面是加to do还是 doing 举些例子啊~
例如,
We just couldn't help ___when John told us that funny story.
这里的空处是加laughing 还是 laugh?
help还有什么用法啊?

can not help doing忍不住做某事
固定搭配