YOU SAID:

Grass is only green where your after it.

INTO JAPANESE

草は緑場所のみ、それの後。

BACK INTO ENGLISH

Grass is green only after it, after it.

INTO JAPANESE

後、後草は緑です。

BACK INTO ENGLISH

[あと] /after /following/subsequent/posterior/post/

INTO JAPANESE

後

BACK INTO ENGLISH

[あと] /after /following/subsequent/posterior/post/