for nothing
without payment无代价地；白费；无缘无故
They quarrelled for nothing．他们不为什么事情就吵架了。
I got it for nothing．我免费得到这东西。
I have not studied English for nothing．我没有白学了英语。
I have come all the way for nothing．我远道而来，毫无收获。
It was not for nothing that he spent three years studying the subject．他花了3年时间，研究这门学科，不是没有结果的。