YOU SAID:

I don't understand why he was saying

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なぜ彼が言っていたのか分からない

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I don't know why he was saying that.

INTO JAPANESE

なぜ彼がそう言っていたのか分からない。

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I don't know why he said that.

INTO JAPANESE

なぜか口から出た

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I don't know why I said that.

INTO JAPANESE

なぜか口から出た

BACK INTO ENGLISH

I don't know why I said that.