If A is the case, then (let's) B
6
彼女の誕生日プレゼント?それなら本がいいんじゃないかな。
A present for her birthday? If that's the case, a book'd be nice, wouldn't it?
7
今日は飲み会なんだ。それなら晩ご飯要らないわね。
You've got a drinking party today. That being the case, you won't need dinner, right?
6
お子さんが熱を出したって?それなら早く帰りなさい。
You say your kid has a fever? If that's the case, please go home early.
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