—Isn’t Ann’s husband over there? —No, it _____ be him — I’m sure he doesn’t wear glasses.

－May we start the meeting now?－No, we________ . We__________ to start until the manager comes.

—______ you help me mend the radio? —Yes, I can. 

When we were young, every evening my brother and I ___ stay at home waiting for my mother?

—Why can your neighbor know so much about London?—He ____ have been there before.