You had better not be late tomorrow.
あすは遅刻してはいけない
You might consider changing the name of the shop.
店名の変更をお考えになってはどうでしょう
You must get up at 5 a.m. so as to catch the first train.
一番列車に間に合うように午前５時に起きなくてはいけません
You must not guess at the answers.
当て推量で答えてはいけない
You must not misbehave so.
そんな無作法をしてはいけない
You must so instruct them that they will not repeat the mistake.
過ちを繰り返さないよう指導しなくてはなりません
You must take his stories with a grain of salt.
彼の話はまともに受け取ってはいけない
You mustn't sign the contract until you hear from me.
私から連絡のあるまで契約書に署名してはいけない
You need to set [put] your mind to your business.
仕事に全力を傾けなくてはいけない
You should never try to conceal the real you.
ほんとうのあなたを隠そうとしてはいけません
