为什么classes begin中classes变class时,begin变begins

为什么classes begin中classes变class时,begin变begins classes begin at enght.为什么classes 是Class begin.还是Class begins.还是Classes begin.为什么? Our Maths classes ( ) at 7:30 every day.括号中应该填begin还是begins?为什么? classes begin可不可以写成 begin the 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？ begins class和classes begin为什么加s? Classes begin at eight. （ ）_______ at 8：00 in the morning.A.The classes begins B.Class begin C.Class begins1,He has lunch quickly.= He has _________ _________ lunch.（ ）2._______ at 8：00 in the morning.A.The classes begins B.Class begin C.Class begins D.Begin cla classes begin begin要不要加s? Classes begin ______seven fifty -five. 书上说是“Classes begin at eight.She has four classes in the morning.”我疑惑为什么不是Class begin和four class in the morning. What time do your classes begin?这句话的classe为什么用复数? we always begin classes at () eight oclock?括号中填什么?急 classes begin at （eight）划线提问 classes begin at （eight）划线提问 What time do classes begin?答句 .your classes begin at 7:33?