*** NOT A TEACHER ***
(1) In the United States, you live on a street: John Doe lives at 4430 West Street.
John Doe lives on West Street.
(2) In the United States:
(a) Where's Mona? She's at school right now. She will be home by 4 p.m.
(b) Does George work? No, he doesn't. He's in school. (= he's a student).