Найдите одну ошибку в предложении: He is postman, so he has breakfast at 4 a.m. I come to school by the bus.
he is a postman- пропущен артикль
He is a (обязательное нужен артикль) postman, so he has breakfast at 4 a.m. I come to school by the - а здесь артикль не нужен bus.