YOU SAID:
I have never seen this man in my life.
INTO JAPANESE
私は私の人生でこの男を見たことがありません。
BACK INTO ENGLISH
I have never seen this guy in my life.
INTO JAPANESE
この人をみたことがない
BACK INTO ENGLISH
I have never seen this guy before in my life.
INTO JAPANESE
この人をみたことがない
BACK INTO ENGLISH
I have never seen this guy before in my life.
That didn't even make that much sense in English.