It"s time for class.Please go back to your classroom.为什么是for,to 而不是to,to或 for ,for
问题描述：
It"s time for class.Please go back to your classroom.为什么是for,to 而不是to,to或 for ,for
答
it's time for 后接名词、代词或动名词
it's time to 后接动词的原形
it's time for class = it's time to begin the class 该上课了