YOU SAID:

Please do not walk on the grass.

INTO JAPANESE

ください、草を歩いてはいけない。

BACK INTO ENGLISH

Please do not walk the grasses.

INTO JAPANESE

草は歩かないで下さい。

BACK INTO ENGLISH

Please don't walk in the grass.

INTO JAPANESE

草に歩かないでください。

BACK INTO ENGLISH

Do not walk on the grass.

INTO JAPANESE

芝生の上を歩かないでください。

BACK INTO ENGLISH

Do not walk on the grass.