clsses begin at eight o'clock为什么用clsses?

clsses begin at eight o'clock为什么用clsses? 【begin with ,begin by,begin at,begin from】区别是什么? Classes begin at eight. class begin at 8:00 classes begin at （eight）划线提问 classes begin at （eight）划线提问 class ______(begin)at eight o'clock. They__________--(begin)the meeting at 8 yesterday Schooi _________(begin) at nine o'clock. Class___(begin)at 8:00 every day I begin my class at six .your classes begin at 7:33? classes begin at enght.为什么classes what's do you have clsses today? in the different clsses 是否对? begin begin Classes begin at eight.对at eight提问