YOU SAID:

I do not know failure.

INTO JAPANESE

失敗はわからない。

BACK INTO ENGLISH

I don't know if I will fail.

INTO JAPANESE

失敗するかどうかはわかりません。

BACK INTO ENGLISH

I don't know if it will fail.

INTO JAPANESE

失敗するかどうかはわかりません。

BACK INTO ENGLISH

I don't know if it will fail.