YOU SAID:

Their failure was inexcusable.

INTO JAPANESE

彼らの失敗は許し難かった。

BACK INTO ENGLISH

Their failure was invoave.

INTO JAPANESE

彼らの失敗は引き起きていた。

BACK INTO ENGLISH

Their failure was causing.

INTO JAPANESE

彼らの失敗が引き起こされていた。

BACK INTO ENGLISH

Their failure had been caused.

INTO JAPANESE

彼らの失敗は引き起こされていた。

BACK INTO ENGLISH

Their failure had been caused.