Can't help doing sth情不自禁做某事
I can't help doing sth. 我情不自禁做。
I cannot help doing so under these circumstances. 在这样的情况下我不得不这样做。
Go beyond one's duty in doing sth. 超越职权范围做某事。
Cannot avoid or help doing something. 不可避免或禁不住做某事情。
Have an opportunity for doing sth. 有[没有,很少有,有不多的]做某事的机会。
Such being the case, I can'; t help but support him. 既然如此,我不能不支持他。
I didn' t know I was breaking the law, ie doing sth illegal. 我并不知道自己已违法。