How to say unless in Japanese

Example Sentences

私watashi はha ストレスSUTORESU がga たまるtamaru とto 食欲shokuyoku がga なくなるnakunaru のno ではなくdehanaku、逆にgyakuni 何かnanika 食べないtabenai とto 気が済まなくkigasumanaku なるnaru。: I don't lose my appetite when I get stressed, rather I can't calm down unless I eat something.
重大なjuudaina 罪tsumiにniついてtsuite はha、指導者shidousha にni 告白kokuhaku しshi なければnakereba 赦しyurushi をwo 受けるukeru ことkoto がga できないdekinai とto もmo 教えていますoshieteimasu。: They also teach that, for great sins, they cannot receive forgiveness unless they confess to their leader.
あはは・・・ahaha///ごめんgomen ねne。ちょっとchotto コンタクトKONTAKUTO してshite くるkuru のno 忘れwasure ちゃってchatte。ここkoko じゃないjanai とto 見えないmienai んだnda。: Oh, sorry for not noticing you. I can only see it (the game) from here.
話し掛けhanashikake なければnakereba、めったにmettani 話hanashi をwo しないshinai 人hito もmo いるiru。: There are people who seldom speak unless they're spoken to.
話しかけないhanashikakenai 限りkagiri めったにmettani 話さないhanasanai 人hito もmo いるiru。: There are people who seldom speak unless they're spoken to.

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