Classes begin at 8:00.为什么要用begin 下文说 Classes are over at four.为什么不可以说 Classes are begin at 8:00呢？

Classes begin at eight. We begin classes at 8：00（对begin classes提问） classes begin at enght.为什么classes Classes begin at 8:00.为什么要用begin 下文说 Classes are over at four.为什么不可以说 Classes are begin at 8:00呢？ Classes begin at 8:30( 请翻译） Classes begin at 8:30(改为同义句） Our classes begin at 8:00.这里的 begin可以换成start吗? classes begin at （eight）划线提问 classes begin at （eight）划线提问 .your classes begin at 7:33? our classes begin at 8:00 a.m =____ ____ our classes at 8:00 a.m our classes begin at 8:00a.m.=_____ _____our classes at 8:00a.m. Classes begin at eight.对at eight提问 our classes begin at 8:00 a.m 的同义句是什么? C__________ begin at 8:00 am.He has four classes in the morning and three i 1、 begin at 8:00.A.The class.B.Class C.Classes Classes _____ at 8:00 every day .A .study B.studies C.begin D.begins帮个忙啊 Our classes begin at 8:00a.m.的同义句____ _____our classes at 8:00a.m一个空填一词