it is time for class 也可以说 it is time to class吗? 介词可以互换?

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it is time for class   也可以说  it is time to class吗?  介词可以互换?

it is time for class 也可以说 it is time to class吗? 介词可以互换?
it is time for class 也可以说 it is time to class吗? 介词可以互换?

it is time for class 也可以说 it is time to class吗? 介词可以互换?
it is time for sth
it is time (for sb 常常省略) to do sth.
通常说 it is time for class.就可以了.
不说it is time to class.因为class 作动词用时的意思是:
把...分类(或分等级)

不可以,这里只能用for

可以互换
to 这里表示动作的方向
事实上也可以说成it is time to go to class

同意lidake2005,或者说it's time to go to class

it is time for class ,class为名词。
it is time to class,class为动词。