北师大版高中英语选修七学案 Unit21 Grammar.doc

混合条件句【归纳】混合条件句又称错综时间虚拟条件句，指主句和从句所指的时间不一致，动词的形式需要根据表示的时间来调整。如：1. 事实：i did not catch the bus this morning, so i am late now.条件句：if i had caught the bus this morning, i would not be late now.条件从句表示与过去事实相反的假设，而主句表示与现在事实相反的结果。由此可知，混合条件句可以用来谈论“想象的过去事件可能对现在造成的影响”。其构成形式是：if +主语+ had done, 主语+ would +动词原形。2. 事实：i am not good at french. i did not understand what that man said.条件句：if i were good at french, i would have understood what that man said.条件从句表示与现在事实相反的假设，而主句表示与过去事实相反的结果。由此可知，混合条件句可以用来谈论“非真实的想象中的现在状态可能对过去造成的影响”。 其构成形式是：if +主语+动词过去式（be过去式用were）, 主语+ would +have done。【即学即练】i. 将下列句子改写为虚拟条件句。1. i didnt learn chinese, so i am not able to translate this passage for you._2. simon forgets his wallet, so he didnt buy the book. _3. alex didnt book a table in advance, so he is waiting in line now. _4. tony doesnt have enough time to visit more places, because he lost his way in the town this morning._ii. 从a、b、c、d四个选项中，选出可以填入空白处的最佳选项。1. if i had the english version of the novel, i _ it to you now.a. lent b. had lent c. would lend d. would have lent2. if kelly were a little younger, she _ that job last week.a. would get b. would have gotc. got d. had got 3. if martin had passed the driving test, he _ able to drive his car to the party now. a. would be b. was c. would have been d. were 4. if i had enough money, i _ a new car last year.a. bought b. had bought c. would buy d. would have bought5. if eric had followed his fathers orders, he _ sick today.a. wasnt b. wouldnt be c. isnt d. wont be答案【即学即练】i.1. if i had learned chinese, i would be able to translate this passage for you.2. if simon didnt forget his wallet, he would have bought the book.3. if alex had booked a table in advance, he would not be waiting in line now.4. if tony hadnt lost his way in the town this morning, he would have enough time to visit more places.ii.1-5 cbadb高考中的情态动词情态动词是高中英语语法学习的重点和难点之一，之前我们已经学习了情态动词的详细用法，下面让我们看看高考是从哪些角度考查情态动词的。【真题呈现】1. you neednt take an umbrella. it isnt going to rain.well, i dont know. it _ do. (北京2013)a. might b. need c. would d. should2. when i was a child, i _ watch tv whenever i wanted to. (江西2013)a. should b. could c. must d. need3. since nobody gave him any help, he _ have done the research on his own. (2013新课标全国卷ii)a. can b. must c. would d. need4. its quite warm here; we _ turn the heating on yet. (天津2012)a. couldnt b. mustnt c. neednt d. wouldnt5. i _ thank you too much for all your help to my son while we were away from home. (陕西2012)a. wont b. cant c. can d. will6. they _ have arrived at lunchtime but their flight was delayed. (2011新课标全国卷)a. will b. can c. must d. should7. _ i take the book out?im afraid not. (四川2010)a. will b. may c. must d. need8. you _ buy a gift, but you can if you want to. (湖南2010)a. must b. mustnt c. have to d. dont have to9. i havent got the reference book yet, but ill have a test on the subject next month.dont worry. you _ have it by friday. (江苏2010)a. could b. shall c. must d. may【点拨】1. a。由上句及well, i dont know可知，答话者认为有可能会下雨。故选might表示“可能”。2. b。题意：当我是个孩子时，无论何时我想看电视就可以看。故选could表示“可以，能够”。3. b。由“既然没人能给他任何的帮助”可以推测，他“一定（must）”是自己做的研究。must have done表示“想必/准是/一定做过某事”。4. c。由“这里很暖和”可以推测，我们还“没必要（neednt）”开暖气。5. b。“cant . too”是固定表达，意为“怎样也不为过”。题意：对于你在我们不在家期间给我儿子的所有帮助，我怎样感谢也不为过。6. d。由“但是他们的航班被耽搁了”可以推测，他们原本“应该（should）”在午饭时间到达。should