必ず (かならず, kanarazu) Japanese meaning: always | Kotomora出
し
て
ください
。
Please be sure to submit your homework.
He always keeps his promises.
Usage patterns
〈事〉を必ず〈動詞〉to be sure to do something without fail
I will definitely keep my promise.
必ず〜てくださいplease be sure to do something
Please be sure to come at nine o'clock tomorrow.
〈事〉は必ず〈事〉one thing is always followed by or true of another
When spring comes, the cherry blossoms are sure to bloom.
間違いない
必ず is an adverb meaning 'without fail', focusing on inevitability, while 間違いない is an adjective-like expression stressing certainty of truth.
必ず stresses certainty or inevitability ('without exception'), while 是非是非 stresses the speaker's strong personal desire or invitation.