YOU SAID:

I don’t know why that is

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なぜそうなるのかは分からない

BACK INTO ENGLISH

I don't know why that happens

INTO JAPANESE

なぜそうなるのか分からない

BACK INTO ENGLISH

I don't know why this happens

INTO JAPANESE

なぜこんなことが起こるのか分からない

BACK INTO ENGLISH

I don't know why this happens