can/may/must表推测的用法case用法小结
1、can/may/must表推测的用法
can, may, must等都可用于表推测，但它们的含义和用法不同。
must语气最肯定，指“一定、必定”，只用于肯定句中。“must+动词原形”表示对现在情况的推测；“must + have + done ”表示对过去情况的推测。如：
Mum must be cooking supper now.妈妈现在一定在做晚饭。
He must have finished his work.他一定完成他的工作了。
May/might 表示“或许，可能”。如：
Tom may go abroad next year.汤姆明年可能要出国。
She might have finished the work.她可能已完成这项工作了。
He can’t know the answer.他不可能知道这个答案。
can/could 表示“可能，会”，我用于否定和疑问句中。如：
Could she he at home?她可能在家吗？
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can,表示一时的情况，意为“有时侯会……”。can的这种用法，只用在肯定句中。如：Children are lovely, but they can be tiring.Training by yourself in a game can be highly dangerous.2、case 用法小结(1)名词case的词意①意为“情形、情况”。If that’s the case, you’ll have to work much harder.如果是那种情形的话，你将不得不更加努力地工作。②意为“病例、案例”。There were seven cases of cholera.有7起霍乱的病例。The civil case will be heard in court next week. 这一案件将于下星期审理。③意为“箱、盒、容器”。John bought a case of beer.约翰买了一箱啤酒。 1. Nowadays，a large number of women，especially those who conicfromthe countryside， inthe clothing industry". A .is working B.works C.work D worked 2._ of the land in that district covered withtrees and grass. A.Two-fifth;is B.Two-fifth;are C Two-fifths;is D Two-fifths;are 3.About 90 percent of the equipment presented by the administration，as well as the facilities of our own， made good use of in teaching. A.have B.has C.have been D.has been 4.The nunther of the students who took part in the competition 500，but only a small number of them chosen。 A was;were B were;was C.were;were D.w;was 5.A large of money is spent on the Hope Project and a good inany schools setp. A amount：has been B amount：have been C.number;has been D deal;have been 1 C。【解析】句子的主语是a large number of women，谓语动词应用复数形式。其中speciallythose who conicfromthe countryside是插入成分，作womell的同位语。因此正确答案是C。 2.C。【解析】第一空考查分数的构成，当分子大于l时，分母应用复数形式。又因主语Two-fifths the land中land是不可数名词，谓语动词应用单数形式。所以答案选C。 3 D。【解析】本句的主语是About 90 percent of the equipment，所以谓语动词应该用单数形式。又因为谓语动词和主语之间是动宾关系，所要用被动语态。 4 A。【解析】T he nunther of +可数名词复数作主语时，谓语动词用单数形式;a nunther of可数名词复数作主语时，谓语动词用复数形式，所吼答案选A。 5.B。【解析】money是不可数名词，应用A large amount of修饰;谓语动词用复数形式。
