You'd ought to think twice before you talk about murder like that.
そんなに簡単に人殺しの話なんかするもんじゃない．
You'll be [You should be so] lucky!
((略式))そうそううまくいくかね，虫のいい話だな
You'll gradually move from “Me” to “We”, and that's what marriage is about.
「私」から次第に「私たち」に変わっていくのが夫婦というものだ
You'll see that there might be a problem.
問題があるとわかるでしょう
You'll thank me (for A).
((略式))（今は迷惑かもしれないが）（Ａについて）いつか私に感謝する日がくるよ
You're [What] a star!
((英略式))（親切に助けてくれて）どうもありがとう［君のおかげだ］
You're always complaining.
いつもぐちばかりだね
You're continually making poor excuses.
君はへたな言い訳ばかりしているね
You're either with me or against me.
私に賛成するか，さもなくば反対するかどちらかだ
You're kidding (me)! ＝You must be kidding (me)!
((略式))まさか，そんなこと
