---Can you play the guitar?---________.

---There’s someone knocking on the door. Who _________ it be?---It must be John. He promised to be here at 8:00.

 — Shall I tell John about it ?— No , you         . I’ve told him already .

My pen doesn’t work well. Could I borrow _____, John?

—Must I make a phone call to him now?  —No, you________. You ______ write an email.