Things that “Should be”

Vocabulary

()つ・くu-verbto arrive
約束(やくそく)やく・そくpromise
(まも)まも・るu-verbto keep, protect
(きず)つけるきず・つけるru-verbto hurt
()し・るu-verbto know
(こた)こた・えanswer
()わるお・わるu-verbto finish
(ただ)しいただ・しいi-adjcorrect
(うそ)うそlie
()めるせ・めるru-verbto blame

Expressing expectation or obligation that is logical or moral.

はず (Expected to be)

“It is supposed to be…” based on calculation or logic.

(かれ)はもう()いたはずだ。He should have arrived by now.
この(こた)えは(ただ)しいはずだ。This answer should be correct.
彼女(かのじょ)()っているはずがない。There's no way she knows.

Negative: はずがない

そんなはずがない。That can't be right.
失敗(しっぱい)するはずがない。There's no way it will fail.

べき (Ought to)

“One should…” based on duty or morals.

約束(やくそく)(まも)るべきだ。One should keep promises.
(ひと)(きず)つけるべきではない。One should not hurt others.
学生(がくせい)勉強(べんきょう)すべきだ。Students should study.

Negative: べきではない

(うそ)をつくべきではない。One should not lie.
(かれ)()めるべきではない。You shouldn't blame him.