can't help but doing,can't help but do ,can'help doing的区别

can't help doing忍不住做——-
can't but do 只能做——，没有别的选择
I can't help laughing
我忍不住笑起来
I can't but laugh
我只能笑了笑。

没有can't help but doing

can't help but doing没有这个用法

can't help but do 是没别的选择，只有做某事
例如：Under her staring，I can't help but looking another way
在她的注视下，我不得不回避她的目光

can'help doing是情不自禁地做某事
例如：
I can't help thinking about her
我情不自禁地想她