The Smiths后面用is还是are

The Smiths后面用is还是are The Smiths are Americans. __the smiths going to move where are 还是what is The smiths后用单数还是复数 THE KIND OF GAMES 后面用IS还是ARE~ none of the students -------后面用are 还是 is The twin 后面是is还是are? where are the smiths from? The Browns are ( ) Smiths' neighborhoods two nouths后面用is还是are few.people后面用is还是are everything后面应该用is还是are?