Unit 3Language in use情态动词情态动词表示说话人对某一动作或状态的态度,或表示主观设想
情态动词有自己的词义,无人称和数的变化 (have to 除外 )
情态动词不能单独作谓语动词,必须后接实义动词或系动词原形构成谓语
其具体用法见下表
—①I saw Kevin in the supermarket this morning
—No, it ________ him
He moved to Canada last week
(2010年广东 )A . can beC . can't beB . must beD . mustn't beC 题意:“今天上午我在超市遇见凯文了
”“不,那一定不是他
他上个周就移民加拿大了
”由题意可知是表示否定的猜测,故用 can't
②She ________ go to the supermarket far from her home—nowhereelse is good enough for her
(2010 年广东佛山 )A . mustB . has toC . canB题意:她不得不去离她家很远的超市,因为没有其他更好的地方了
表示客观上“不得不”要用 have to
A . mustn'tC . needn'tB . shouldn'tC . can'tC 题意:桌子不脏,你不必擦它
needn't 表示“不必要做”
mustn't 禁止, shouldn't 不应该, can't 不能,均与题意不符
③The desk is not dirty
You ________ clean it
(2010 年江苏盐城 )④Boys and girls, don't forget your report
It ________today
(2010 年浙江衢州 )A . can't finishB