动词短语可以做谓语。如hewenttoschool.(gotoschool动词短语做了谓语)介宾短语可以做表语,定语,状语,补语,如heisintheclassroom.(表语)thebookonthedeskismine.(定语)pleaseputthebookinthebag.(状语)makeyourselfathome.(宾补)