1、Unit 8 It must belong to Carla第四课时 Section B (2c-self check) 词汇mystery*句型1. Im still waiting for the bus,so I must be a bit late for the party.重点难点1. To review the important points.2. To practice writing skill.一、完成下列单词和短语的翻译：1. 奥秘_ 2.其他的_3. 和相似_ 4.阻止_二.填空。1. We now know what was _(发生) in the neighbo
2、rhood.2.The sweater _(一定是)Carlas,she is the only one who wears such colorful clothes.3.I like_(弹钢琴) .语法精析情态动词的用法归纳情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。 情态动词无人称和数的变化；不能单独使用，必须与其后的动词原形构成谓语一、 can, could1) 表示能力（体力、知识、技能）。Can yo
3、u lift this heavy box?（体力）Mary can speak three languages.（知识）Can you skate?（技能）此时可用be able to代替。Can只有一般现在时和一般过去式；而be able to则有更多的时态。Ill not be able to come this afternoon.当表示“经过努力才得以做成功某事”时应用be able to，不能用Can。如：He was able to go to the party yesterday evening in spite of the heavy rain.2) 表示请求和允许。-C
4、an I go now? - Yes, you can. / No, you cant. 此时可与may互换。在疑问句中还可用could,might代替，不是过去式，只是语气更委婉，不能用于肯定句和答语中。- Could I come to see you tomorrow? - Yes, you can. ( No, Im afraid not. )3) 表示客观可能性（客观原因形成的能力）。Theyve changed the timetable, so we can go by bus instead.This hall can hold 500 people at least.4) 表
5、示推测（惊讶、怀疑、不相信的态度），用于疑问句、否定句和感叹句中。Can this be true?This cant be done by him.How can this be true?二、 may, might1) 表示请求和允许。might比 may语气更委婉，而不是过去式。否定回答时可用cant或mustnt，表示“不可以，禁止”。-Might/ May I smoke in this room? - No, you mustnt.- May/Might I take this book out of the room?- Yes, you can. (No, you cant /
6、 mustnt. )用May I.？征徇对方许可时比较正式和客气，而用Can I.？在口语中更常见。2）用于祈使句，表示祝愿。May you succeed!3) 表示推测、可能性（不用于疑问句）。might不是过去式，它所表示的可能性比may小。1He may /might be very busy now.2Your mother may /might not know the truth.三、 must, have to1) 表示必须、必要。You must come in time.在回答引出的问句时，如果是否定的，不能用mustnt（禁止，不准），而用neednt, dont hav
7、e to（不必）.- Must we hand in our exercise books today?- Yes, you must.- No, you dont have to / you neednt.2) must是说话人的主观看法， 而have to则强调客观需要。Must只有一般现在时， have to 有更多的时态形式。1The play isnt interesting, I really must go now.2I had to work when I was your age.3) 表示推测、可能性（只用于肯定的陈述句）1 Youre Toms good friend,
8、so you must know what he likes best.2 Your mother must be waiting for you now.四、must be may be might becould be cant be的用法。must be语气强硬的，“必须、一定”之意 may bemight becould be语气不确定，“可能”之意 cant be语气偏强硬，“不可能”之意.1 -Must we do it now ? No , you_. A .wont B .neednt C .cant D .dont2 He _at home,Im not sure. A .m
9、ay B. cant be C .may be D. must be3 You _to the meeting this afternoon if you have something important to do. A neednt to come B. dont need come C. dont need coming D .neednt come4 “May I pick a flower in the garden?” “_.” A No, you neednt B Not, please C. No, you mustnt D No, you wont5 Youd better
10、_late again. A dont B not be C. not being D wont be 6 “Can I leave this door open at night?” “You _better not.”A should B would C could D had7. Put on more clothes. You _be feeling cold with only a shirt on. A can B could C would D must 8 I thought you_ like something to read, so I have brought you
11、some books.A may B might C could D must9 I saw Linda in the supermarket. -It_her,she has gone to Shenzhen. A .should be B .may be C .must be D .cant be10 The plant is dead. I _it more water. A will gave B would have given C must give D should have given11 Its freezing outside. You _put on your overc
12、oat.A had better to B had better C would better D would better to12 You _ return the book now. You can keep it till next week if you like. A cant B mustnt C neednt D may not13 Where is my pen? I _ it.A might lose B would have lost C should have lost D must have lost14 I didnt hear the phone. I _ asl
13、eep.A must be B must have been C should be D should have been15 He _ you more help, even though he was very busy. A might have given B might given C may have given D may give16 A computer _ think for itself; it must be told what to do. A cant B couldnt C may not D might not17-Could I borrow your dictionary? - Yes, of course you _. A .might B. will C. can D. should5
