—Who is speaking there? —It        be Uncle Li. He has gone to Shanghai.

She __________ be here. I saw her come in.

Tom ____ be ill, for I saw him playing basketball an hour ago. 

According to common practice, the president _________ hold office for five years.

—Shall I inform him of the change of the schedule right now? —I am afraid you       , in case he comes late for the meeting.