are are are is is is ,why

are are are is is is ,why am is are 过去式 Everyone is?everyone are? What are there is is/are的过去式 is are过去式 是am is are Where are Where is am is are. 用am,is,are 用is还是are? It__you that __to blame.A.is;is B.is;are C.are;are D.are;is am、is、are、 用am,is,are you are beautiful is is am are the students is /are is are 什么时候用?