a fag end
一事无成
A: I'm wondering why I come to a fag end after another.
A: 真不知道我为什么总是一事无成。
B: I think you are not trying your best.
B：我觉得你还不够努力。
A: Why? You are so rude to me. I used to think that I had a considerate wife.
A: 你对我太不客气了。我还以为我找了个体贴的老婆呢。