【2013河南】26. -Dad, must we wait until the light becomes green?
-Yes, Im afraid we______ .Thats the traffic rule.
A. can B. may C. have to D. need
【答案】C
【解析】考查情态动词的用法。由上文句意我们必须等到灯变绿吗？和下文句意那是交通规则可知，我们必须要等到灯变为绿色。have to不得不，强调客观上的要求。
【2013河北】34._ I see your ID card, sir? We have to check your information.
A. May B. Must C. Should D. Need
【答案】A
【解析】考查情态动词的运用。向别人请求许可可用can，may。根据句意，我可以看一下你的身份证件吗？我们不得不核实你的信息。可知此处表示请求许可，故答案应选A。
【2013 甘肃白银】37. Finish your homework first, then youll _______ watch TV for an hour.
A. can B. be able to C. able D could
【答案】B 考查助动词用法。 will是助动词，其后应该用动词的原型，故选B。
【2013广东梅州】35.-Amy, I hear youve got many foreign coins. ______ I have a look?
-Of course, Ill fetch them for you.
A. May B. Must C. Should D. Need