YOU SAID:
dont come to school tomorrow
INTO JAPANESE
明日学校に来てはいけない
BACK INTO ENGLISH
Do not come to school tomorrow
INTO JAPANESE
明日学校に来ないで
BACK INTO ENGLISH
Don't come to school tomorrow
INTO JAPANESE
明日学校に来ないで
BACK INTO ENGLISH
Don't come to school tomorrow
That didn't even make that much sense in English.