YOU SAID:
He turned in the research paper on Friday; otherwise, he would have not passed the class. She advised him to come back at once.
INTO JAPANESE
彼は金曜日に研究論文を発表した。さもなければ、彼はクラスを通過しなかったでしょう。彼女はすぐに戻ってくるようアドバイスした。
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INTO JAPANESE
さもなければ
BACK INTO ENGLISH
For another way
You've done this before, haven't you.