It is no good crying over spilt milk.
直译:为打翻的牛奶哭泣没有用.(习语:覆水难收)
从语法角度说,it作形式主语时常用来指代to do sth或从句,所以It is + adj./n. + to do sth很常见;但下面这几个结构是特殊的,是用it指代了doing sth
It is no use doing sth.做某事没有用.
It is no good doing sth.做某事没有好处.
It is a waste of time doing sth.做某事是浪费时间.
所以要填crying
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