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

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canthelpdoing,canthelpbutdo,havenochoicebuttodo,couldn''tdonothingbutdo这些都怎么理解不要死记,我想知道为什么是这样canthelp

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
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

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
cant help doing,情不自禁做某事
cant help but do 不得不做某事
,have no choice but to do,除了做某事别无选择
couldn't do nothing but do只有做否是