YOU SAID:
If there is grass on the field, play ball
INTO JAPANESE
畑に芝生がある場合は、ボールをプレーする
BACK INTO ENGLISH
If there are lawn in the field, play the ball
INTO JAPANESE
野原に芝生がある場合は、ボールをプレーする
BACK INTO ENGLISH
If there are lawn in the field, play the ball
That didn't even make that much sense in English.