Найдите ошибки 1.I don't think we should buy him this tie.He mastn't like the color.2. My brother have to walk the dog.It

1. I don\'t think we should buy him this tie. He may not like the color.2. My brother has to walk the dog. It is his chore. (My brother must walk the dog.)3. Have your parents checked your homework diary?4. I might not come to the club tomorrow because I have to go to the doctor.