2019春高中英语 Unit 1 Festivals around the world情态动词表示“推测”的用法素材 新人教版必修3.doc

1、情态动词表示“推测”的用法英语中，情态动词can / could, may / might, must / can, would / should 等都可以表示“推测”。具体用法如下：1. can 和could can 表示推测时，可能性比较大，用于疑问句或否定句中，不用于肯定句中， 意思是“不可能”。表示一种有把握的推测。表示否定时，cant语气最强。如：It cant be Mr Li. He has gone to Nanjing already. They cant know the answer. Let me explain it to them. That cant be her

2、 husband. She is still single. could 表示推测时，可以用于否定句，也可以用在后面跟不定式一般式的肯定句。表示可能性不大的推测。意思相当于may / might。如：Anything could happen if you do not obey the rule. It could be true. But I still doubt it.2. may和might may / might 表示一种“可能性很小”的推测。多用在肯定句或否定句中，might 用在疑问句中表示“可能”，语气最弱。如：My English teacher may be correc

3、ting our exercises in her office. My sister may not be in her room at this moment. The scientists might be discussing the pollution problem. 3. must 和can 在表示推测的情态动词中，must 的把握最大，意思为“一定，肯定”。表示对一般情况的推测。如：Your sister must be a doctor, isnt she?The boys must be playing football on the playground, arent t

4、hey? Li Ping must be punished by his father.（以上几句要注意其反意疑问句的构成）can的推测用法：在肯定句中can 可以表示客观的（理论的）可能性，并不涉及具体某事是否会发生，此用法常常可以说明人或事物的特征。 如：Accident can happen on such rainy days. cant do表示对现在发生的事情做否定的推测。cant have done 表示对过去发生的事情做否定的推测。如：He cant be there now. Mary cant have stolen your money. She has gone home.4. would 和should 英语中，情态动词would 并不一定与过去的时间有关，而表示可能性弱于will。should 表示推测时，表示确定或可能有的未来或期望。如：Its nearly seven oclock. Jack should be here at any moment. When can I come for the photos? I need them tomorrow afternoon. They should be ready by 12:00.