It is time to do something.和It is time for something(前者接动词,后者接名词,有时可以互换),如
It is time to have classess./ It is time for class.
It is time to have lunch.= It is time for lunch.
It is time to do something.和It is time for something(前者接动词,后者接名词,有时可以互换),如
It is time to have classess./ It is time for class.
It is time to have lunch.= It is time for lunch.