Choose the correct form: 1) i (am, is) a student now. 2) we (is, are) all students now. 3) he (am, is) a student of mathematics. 4) (is, are) she a mathematician? 5) she (was, were) a student of this college. 6) he (is, am) not english. 7) they (was, were) in london at that time. 8) (was, were) he in london too at that time?