例8:A left-luggage office is a place where bags ____ be left for a short time, especially at a railway station. (2003全国卷)
A. should B. can C. must D. will
例9:The World Wide Web is sometimes jokingly called the World Wide Wait because it ______be very slow. (2005浙江)
A. should B. must C. will D. can
分析:can 表示推测时常用于疑问和否定句中,用于肯定句中常常表示理论上的可能性,用来表达事件或情况可能发生(但并不牵涉到是否真的会发生)。故答案分别为B、D。
二、考查情态动词的推测用法
1、对现在或客观事实的推测
对现在或客观事实的肯定推测一般用must, will, should, may(might)或could,语气依次递减。
例10:Helen _____go on the trip with us but she isn’t quite sure yet. (2005安徽)
A. shall B. must C. may D. can
例11:—I’ve taken someone else’s green sweater by mistake.
—It ___ Harry’s. He always wears green. (2005广东)
A. has to be B. will be C. mustn’t be D. could be
例12:That, I think, ____ be all that I want to say.
A. can B. could C. will D. ought to
分析:must的语气最强,译为“肯定”、“准是”、“想必是”;should的语气次之,译为“很可能”、“应该”,指按常理推测;may (might)译为“也许、大概”,表示把握不大的推断,后面常跟but。could的语气最弱,译为“也许”、“可能”。答案分别为C、D、C。
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