can't but do sth怎么解释

can't but do sth怎么解释 can't but do sth can`t but do sth ,can`t help but do sth can't help do sth/can't help to do sth./can't help doing sth 关于sb can't but do sth的一个小问题 But I can't do 有can't help to do sth这种结构吗?请加以解释用法,意思. can't wait (to do sth)=? can`t help but do ,can`t help doing,can`t choose but do,can` 用它们来造句1 can't choose but to2 choose to do sth3 choose sth fr sb can not only do sth but also do sth这种结构是都正确? can't but do 什么意思