Classes begin at in the morning in my school求语法解释下为什么选哪个A half past seven B thirty sevenC seven and a half D half over seven

Classes begin at eight. Our classes begin at eight in the morning.同义句 classes begin at enght.为什么classes Our school ——at eight in the morning A.begin class B.begin classes C.begins classD.begins classes classes begin at （eight）划线提问 classes begin at （eight）划线提问 .your classes begin at 7:33? 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. C__________ begin at 8:00 am.He has four classes in the morning and three i _____ begin at 7:30 in the morning.A.Classes B.Lessons C.Class D.School I go to school early in the morning.Classes begin at 7:30. Our classes begin at 8:00 in the morning.（改为同义句） — —our classes at 8:00 a.m. We begin classes at 8：00（对begin classes提问） Classes begin at eight.对at eight提问 ( ) (1).Classes begin _______ seven fifty -five .A.in B.on C.at D.for( ) (1).Classes begin _______ seven fifty -five .A.in B.on C.at D.for 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？ We begin our classes at eight o'clock in the moring 是什么意思?急!翻译成中文!急! 1.-What time do classes usually _____ in the afternoon -At two o'clock.A.begins B.over C.to begin D.begin