Unit13__Lesson3__精品课件.ppt

Grammar Summary Modals for Guessing We use the following modal verbs to speculate about the present and the past: must – to express a strong belief that something is/was true (肯定、一定) may/might/could – to express a possibility that something is/was true (可能、也许) may not/might not – to express a possibility that something is/was not true (可能不) can’t – to express a strong belief that something is/was not true (不可能) We use: ● modal + infinitive (without to) to speculate about unlimited present time. He must work very hard. = I’m sure he generally works very hard. 我确信他通常工作很努力。 They can’t have a lot of money. = I don’t think they generally have a lot of money. 我确信他们通常不会有很多钱。 ● modal + be + -ing to speculate about something happening at the moment. They may not be having fun. = I don’t think they are having fun. 我想他们可能不会玩得很高兴。 She could be thinking about her test. = It’s probable that she’s thinking about her test now. 她可能此刻正在考虑这次考试。 ● modal + have + Past Participles to speculate the past. They might have got lost. = Perhaps they got lost. 他们可能迷路了。 Emma must have been very upset. = I’m sure she was upset. 她一定很难过。 Read the dialogue again and complete the gaps with modal verbs: must, may, may not, might, can’t, could I think my French tutor _______ know one of them. They _____ be so frightened. They _____ have been separated from… Or they ______ have gone exploring… They ______be there. … they ________have any water. might must may could can’t may not 1. She goes out every weekend. She _____________ have young children. 2. He looks depressed. He_________ ________be having some problems. Complete the gaps in the sentences with the modal verbs. More than one answer is possible. must, can’t, may, might, might not, could might not/can’t may/might/ could 3. This woman looks like a scholar. She _____________ work at the university. 4. His shoes are muddy. He _______ be working in an office all day. 5. Her clothes are all very expensive. She ___________________be earning a