It's time to ...和 it's time for ...区别?急.

问题描述:

It's time to ...和 it's time for ...区别?急.
It's time to ...和 it's time for ...在任何情况下都可以相互转换吗?
例如:1.It's time to brush teeth.
2.It's time for teeth.
3.It's time for brushing teeth.
哪位可以回答啊1.2.3.到底哪句是正确的?
这个两个句型任何情况都可以转换吗?有什么条件吗?
望高手指教,最好举例说明,

这三句都正确.
to后跟的是动词原形:It's time to have lunch.
for后跟的是名词或动词的ing形式:it's time for lunch
it's time for having lunch
这样应该可以了吧