B.shan't
C.shouldn't
D.needn't 解析:由句中“since you have practiced a lot in school”即“既然你在学校进行了大量的训练”推知“应该”是不会有什么困难。should表推测“按常理推测”。故选C。 答案:C
(上海)It ________ have been Tom that parked the car here,as he is the only one with a car. A.may
B.can C.Must
D.should 解析:句意:一定是汤姆把车停在这里的,因为只有他有车。此句为强调句型,谓语动词为must have been,用must表示语气肯定的推测。must have done表示“(过去)一定做了某事”。 答案:C (南通调研)—John,how did your English exam go? —I thought I ________,but in fact I came in the top 10%in the class. A.should have failed
B.couldn't have failed
C.might have failed
D.mustn't have failed 解析:由句中“I thought I ________,but in fact I came...”知我通过了考试,而在此之前担心“有可能考试不及格”,故选C。 答案:C
语法专题(四) 情态动词
一、情态动词的基本含义 1.表示能力用can,could,be able to。 注意:can与be able to常可互换,但也有不可互换的情况: ①can可用于人或物作主语的句子中,但be able to只能由有生命的名词作主语。 ②can只有一般现在时和一般过去时(could),但be able to可以用于一般现在时、一般过去时、将来时、完成时。还可用于非谓语动词短语。 ③be able to用于过去时表示经过一番努力才能做到,一般用肯定句和疑问句,不能用could代替。如: After doing more practice,he was able to speak English at the meeting.做了更多的练习之后,他能在会上说英语了。 这样考过 ①(2007·东城)We________finish it ahead of time,though it was such a tough task. A.couldB.would C.were able to
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