YOU SAID:

I simply mind my mine.

INTO JAPANESE

私は単に私の鉱山を気します。

BACK INTO ENGLISH

I only mine in my mind the.

INTO JAPANESE

私だけ私の心の中では。

BACK INTO ENGLISH

I just in my mind.

INTO JAPANESE

私は心の中でだけ。

BACK INTO ENGLISH

I'm only in my mind.

INTO JAPANESE

私は心の中でだけ。

BACK INTO ENGLISH

I'm only in my mind.