Class begins为什么Begin要加SClass begins为什么Begin要加S

是Class begin.还是Class begins.还是Classes begin.为什么? Class begins为什么Begin要加SClass begins为什么Begin要加S begins class和classes begin为什么加s? 为什么classes begin中classes变class时,begin变begins the next class begins at half past nine.begin 为什么加s Let's _____our class.begin beginsLet's _____our class.begin begins to begin 是用Class begin 还是Class begins好像class begin是习惯用语,但应该用三单! Our school ——at eight in the morning A.begin class B.begin classes C.begins classD.begins classes The first class ( )at 8:00 amA：begin B:is begin C：begins D:is beginning it's time for class _____.A.to begin B.beginning C.begin D.begins Class begins our story begins的begin为什么加s? what begins fall from the trees.begin为什么加s begin是否有被动?一般不是都说the class begins,the movie begins吗?为什么这句The research is so designed that once begun nothing can be done to change it.却用了被动? Class _____ at eightA.begins B.is beginning C.begin D.beginning THE English class ( )at three oclock A.begin B.begins C.are classes begin at ...和class begins at ...它们有什么区别? 老师喊上课,下课 ,用英语怎么说~class begin ,class begins,class beginning,class is begin?class is over,class over?到底是什么?我想问over 在这是什么词性?名词,形容词,还是副词?begin 在这又是什么词性?