YOU SAID:

It is not a thing to think, it is a thing to smile

INTO JAPANESE

笑顔のことだと思うことではないです。

BACK INTO ENGLISH

Don't think that smile.

INTO JAPANESE

その笑顔とは思わない。

BACK INTO ENGLISH

I don't smile.

INTO JAPANESE

私は笑顔はありません。

BACK INTO ENGLISH

I don't smile.