YOU SAID:

This chair is yours, that chair is mine.

INTO JAPANESE

この椅子は、椅子は私のものであることを、あなた次第です.

BACK INTO ENGLISH

this chair, that chair is mine, is up to you.

INTO JAPANESE

この椅子は、その椅子は私のものです、あなた次第です.

BACK INTO ENGLISH

this chair, that chair is mine, is up to you.