YOU SAID:

My opponent is a liar and he can not be trusted.

INTO JAPANESE

私の相手は嘘つき、彼は信頼することはできません。

BACK INTO ENGLISH

My opponent liar, he cannot be trusted.

INTO JAPANESE

私の相手の嘘つき、彼は信頼できません。

BACK INTO ENGLISH

My opponent a liar, he cannot be trusted.

INTO JAPANESE

私の相手は嘘つき、彼は信頼できません。

BACK INTO ENGLISH

My opponent a liar, he cannot be trusted.