Class is over!分析各个词在句子中的成分over充当什么语啊?快上课了

Class is over!分析各个词在句子中的成分over充当什么语啊?快上课了 为什么是class is over 不是the class is over 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? class is over和after class的区别?class is over和after class的区别? class over 中间有is 吗. 为什么 如何说下课,除了class is over Class is over at 4:00 pm, “class is end ,but not over THc class is over翻译过来是什么 after class和class over意思一样吗?是 class is over对不起打错了 is the class over?or you drop off the class? That eraser over there is my eraser这里的over是啥意思还有并说明各个单词在句中是啥意思并根据各个单词翻译句子 是what time is class over还是what time is the class over请说明理由 有一首歌开头是下课铃声然后背景说了class is over是在看跳舞是听到的 classes are 它和Class is over有什么 区别 Class is over,it’s time（ ）for Sports Day. Class is over.That`s ____for today.应该填什么? the class is over.the students stop____(have)a rest