YOU SAID:

that wasn't supposed to work

INTO JAPANESE

動作するはずではなかった

BACK INTO ENGLISH

it wasn't to work

INTO JAPANESE

それは働くつもりはなかった

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It wasn't going to work.

INTO JAPANESE

それはうまくいきませんでした。

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That didn't work.

INTO JAPANESE

でも上手く行かなかった

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That didn't work out.

INTO JAPANESE

でも上手く行かなかった

BACK INTO ENGLISH

That didn't work out.