いったん約束したのであれば、守らなければならない。
Sentence Analyzer
English Translation
Once you have made a promise, you must keep it.
Furigana
いったん約束 したのであれば、守 らなければならない。
Romanji
Ittan yakusokushita no de areba, mamoranakerebanaranai.
Words
一旦
(いったん)
once; for a moment; temporarily; one morning
約束
(やくそく)
promise; agreement; arrangement; one's word; contract; pact; appointment; engagement; date; convention; rule; destiny; fate
の
(の)
indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question
だ
(だ)
be; is; indicates past or completed action; indicates light imperative
或
(ある)
a certain ...; some ...
守る
(まもる)
to protect; to guard; to defend; to keep (i.e. a promise); to abide (by the rules); to observe; to obey; to follow