YOU SAID:

I'll buy that for a dollar

INTO JAPANESE

私はドルを買うよ

BACK INTO ENGLISH

I'll buy my $.

INTO JAPANESE

私は、私の $ を買うよ。

BACK INTO ENGLISH

I buy my a $ $.

INTO JAPANESE

私が購入する私 $ $。

BACK INTO ENGLISH

I bought my $ $.

INTO JAPANESE

私の $ $ を買った。

BACK INTO ENGLISH

I bought my $ $.