He____know the answer, but I’m not sure.

The man ______ be my father. My father is much taller.

—Why are your eyes so red? You _______ have slept well last night.—Yeah, I stayed up late writing a report.

—Must I pay for the bill now, boss?—No, you __________ pay for it after the meal.

—How did he get my telephone number?—You ________ it . You told him last week．