•For no reason - 无缘无故, 毫无理由、无端, 莫名其妙;
•For a reason – 不是无缘无故的，是有原因的，
•There is no such thing (person) as … - we say this to emphasize that it (the person) does not exist or is not possible. 没有（…）这样的事情／人
•At sb.’s expense / at the expense of sb. - making another person look silly; 捉弄；拿…开心
•Cross the line - 越界，做得过火, 过分了；
- Be about to do - to be going to do something very soon; 刚要,正要; 我正准备…
•End up doing (being) - to reach or come to a place, condition, or situation that was not planned or expected; 最终, 到头来,最后变成, (不在计划意料中的结果，没想到最后)
