YOU SAID:

I can't believe that that is even possible.

INTO JAPANESE

それが可能だとさえ私は信じられない。

BACK INTO ENGLISH

I can not believe even that it is possible.

INTO JAPANESE

それが可能だとさえ信じられない。

BACK INTO ENGLISH

I can not believe that it is possible.

INTO JAPANESE

それが可能だと私は信じることができません。

BACK INTO ENGLISH

I can not believe it is possible.

INTO JAPANESE

私はそれが可能だとは信じられません。

BACK INTO ENGLISH

I can not believe it is possible.