YOU SAID:

I think he has taken this way to far.

INTO JAPANESE

私は彼がこれまでのところずっと進んでいると思います。

BACK INTO ENGLISH

I think he has been going so far.

INTO JAPANESE

私は彼がこれまで行ってきたと思います。

BACK INTO ENGLISH

I think he has been to this point.

INTO JAPANESE

私は彼がこれまでに行ったことがあると思います。

BACK INTO ENGLISH

I think he has been there before.

INTO JAPANESE

彼は以前行ったことがあると思います。

BACK INTO ENGLISH

I think he has been there before.