You should be candid with him about what happened.
何が起こったか，彼に包み隠さず話すべきだ
You should do it immediately.
それをすぐになさってください（◆had betterより弱く丁寧）
You should have been able to read the text over before the lecture.
講義の前にテキストをしっかり読んでおくことができたはずだ
You should have someone check that out.
人に確認してもらうべきだ
You simply mustn't do that.
そんなこと絶対にしてはだめ
You sound pretty sure of yourself.
自信満々の口ぶりだな
You still have some important business to attend to.
君にはまだやるべき大切な仕事がある
You were naughty to push your brother into the pool.
弟をプールに突き落としたりしておまえは悪い子だね
You were right about that.
君の言ったとおりだった
You were stupid to do that.
そんなことしてばかだったね（◆判断の根拠）
