IcannothelpbuttodosthI与cannothelpbutdosth的区别这两种说法都存在吗，什么时候省略to

Question

I cannot help but to do sthI与 cannot help but do sth的区别
这两种说法都存在吗，什么时候省略to

Answer 1

关于cannot .but 的句型主要有如下几种:
1.cannot help but do 不得不做某事
2.cannot but do 只有
3.cannot help doing 情不自禁做某事
4.cannot help do 不能帮助做某事
cannot 貌似没有 :cannot help but to do sth 的结构吧,那是 can't do but to do 的形式
如:I can't do anything but to wait for him.
只有 cannot help but do sth 的结构,我到毕业了都还没碰到 过 cannot help but to do 的形式,或者说碰到过,但是我们都视之为:错误的.