Unit5 Part Four（课件）-《商务英语》同步教学（北京邮电大学出版社）

Unit 5 Workplace 目录 CONTENT Starting-up Part One Reading and Critical Thinking Part Three Listening and Speaking Part Two Grammar Part Four Project Part Six Practical Writing Part Five Part Four Grammar Grammar Modal Verbs 情态动词属于助动词，主要包括 can、could、may、might、must、should、ought to、shall、will、would 等。情态动词与其他动词连用表示说话人的语气，可表达建议、要求、可能和意愿等。情态动词没有人称和数的变化。 Grammar Grammar Grammar Notes 1. must 和 have to 都表示必须，但两者有所区别：must 侧重说话人的主观意志；have to 侧重于客观需要。 I must learn English very well. 我一定要学好英语。 I have to learn English very well. 我不得不学好英语。 2. can 表示“能力”时，和 be able to 同义，在许多情况下可以互换。 Since I have enough money, I can/am able to help her. 3. “情态动词 may (might)、can (could)、must 等 +have+ 过去分词”结构用于对过去所发生的事情进行推测。 Philip may (might) have been hurt seriously in the car accident. 4. “needn’t+have+ 过去分词”结构表示在行为发生后说话人认为“本不必去做某事，但已经做了”。 I dressed very warmly for the trip, but I needn’t have done so. The weather was hot. 5. “should (not)+have+ 过去分词”用于表示责备；肯定式表示说话人认为“该做的事没有做”，而否定式则表示“不该做的却做了”。 You should have come here on time. You should not have parked here. Grammar Exercises I. Complete the following sentences by choosing A, B, C or D. ( ) 1. ——I’m sorry, but I 　　　　　 use the book myself. I must finish it today. ——That’s OK. I 　　　　　 borrow Tom’s. A. must; could B. have to; can C. have to; must D. must; must ( ) 2. You 　　　　　 be tired. You’ve only been working for an hour. A. must not B. won’t C. can’t D. may not ( ) 3. 　　　　　 you tell me how I 　　　　　 get to the bank? A. Do; can B. Can; could C. Could; can D. Could; could ( ) 4. Mr. White 　　　　　 at 8:00 for the meeting, but he didn’t show up. A. should have arrived B. should arrive C. should had arrived D. should be arriving B C C A Grammar ( ) 5. As you worked late yesterday,