It time for class.The students ___(停止唱歌) and ___(准备好) for class It was time for class

It's time for class. it's time for English class.快 It is time for class.(冋义句) It is time for class 什么意思? It's time—[to,for]class it's time for class(改为同义句) it's time?class.it's time for class(改为同义句)it's time?class. It time for class.The students ___(停止唱歌) and ___(准备好) for class It was time for class it is time for class.这里为什么用for? It's time for class.Please l________It's time for class.Please l________ to the teacher. it is time for class 也可以说 it is time to class吗? 介词可以互换? It's time for class(保持句义不变) It' time () ()a class It's time for class 改为否定句It's time ____ _____ class It‘s time for class lucy改为同义句：It‘s time ____lucy ____ ____ class. It was time for class(改写句子,意思不变) It was time ____It was time for class(改写句子,意思不变)It was time _____ ______ class It time for ____. a,clsss b ,have class,c,to class,d,has class is it time for class?的句子成分为什么不能说is it time to class? 或者is it time for the class? 英语翻译Please____ ____!It's time for class It's time for English class.(改为问句）