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?