cant help doing等于什么?如题

cant help doing等于什么?如题 忍不住做某事是can't help doing sth 还是cant't helping doing sth cant help/ stand doing意思快区别,不是意思,打错了 cant help outcan't help out什么用法呀..能举相同的例子么. can't help doing 解释句子等于什么 在线等RT cant help doing,cant help but do,have no choice but to do,couldn't do nothing but do这些都怎么理解不要死记,我想知道为什么是这样 be busy doing等于什么 you cant help wondering这里为什么用help啊? help通常与什么介词搭配,还要help to do ,还是help doing? help with,help for,help to do,help doing意思分别有什么区别,用法有什么不同! help sb with sth 是等于help sb do sth 还是等于help doing sth还是等于help to do sth help sb do sth help sb doing sth help sb to do sth help sb with sth 四者有什么区别 for sb help 和by doing 什么意思RT cant wait和 cant help 后面分别是加不定式还是ing形式? help sb do sth=help sb to do 与help sb doing sth 有什么区别?ps:还有与help sb in doing sth的区别 help sb doing sth 高中英语：can''t help doing sth 与cannot help doing sth请问这两者有没有什么区别?谢谢~ can't help doing sth和can't stand doing sth有什么区别