I.find the mistakes and correct them. 1. you needn’t to wait for me. 2. you may eat so many sweets; it is harmful. 3. horses can sleeping standing. 4. he has not to go to school on sundays. 5. they were have to come tomorrow.

1. You don't need to wait for me. 
2. You don't may eat so many sweets it's harmful.
3. Horses can sleep standing.
4. They are have to come tomorrow.