1.     I (work) ______ him since 1970.

2.     How long _____ you (learn) ______ English?

3.     _______ you (meet) _______ him since we (say) ______ good-bye?

4.      I (wait) ____________for two hours, but she (not come) ____________yet.

5.     He (write) ____________ a book since last year.

6.     How long ____________you (learn) ____________English?