1、Unit 1 Food for thoughtPeriod2 Using language知识点梳理单元语法精讲精练情态动词（一）I.语法感知感知以下课文原句，完成方框下的小题1.I was able to hold a knife and forkand chopsticks!2But there are still some dishes that Dad dare not try even after many years of marriage to my mother.3.Mum and I just have to find a way to get him into the ki
2、tchen!4.wed better not eat too much roast food as it may make us suffer from heat inside our bodies.5“You neednt try it if you dont want to，”Mum said.Choose the meanings to the words in bold above.ABe afraid to do something.BNot be necessary to do something.CGive advice to do or not to do something.
3、DBe necessary or give strong advice to do something.EHave the ability to do something.1E2.A3.D4.C5.BII.语法精析一、基本特征1情态动词有一定的词义，不能单独作谓语，需和实义动词或系动词一起作谓语。She can speak English though she is six.尽管她才6岁，但她会说英语。2情态动词一般无人称和数的变化，个别情态动词有现在时和过去时两种时态变化。They must be in the classroom.他们一定在教室里。3构成否定句时，not放在其后面。The
4、young man cant carry the big stone.这个年轻人搬不动那块大石头。4情态动词后接动词原形。You will do as I told you.你得照我说的去做。二、基本用法1can与be able to(1)can只有现在时和过去时(could)，而be able to则有更多的时态变化，在将来时、完成时和非谓语动词中只能用be able to。(2)can一般指自身具有的能力，而be able to则表示经过一段时间的努力后所具有的能力，相当于manage to do或succeed in doing。(3)在否定结构中was/were able to与cou
5、ld没有区别。This time I failed in the exam，but Ill be able to pass the exam next time.这次我考试不及格，但下次考试我能及格。(经过努力)She ran fast but she couldnt/wasnt able to catch the bus.她跑得很快可还是没能赶上公交车。2need的用法(1)need作情态动词时，后跟动词原形，表示“需要，有必要”，无人称和数的变化，多用于疑问句、否定句或条件句中。Need I finish the work today?Yes，you must/have to./No，yo
6、u neednt.我需要今天干完这活吗？是的，你必须干完。/不用，你不必干完。Theres plenty of time.You neednt drive so fast.时间很充足，你不必开这么快。注意：由need引起的一般疑问句，肯定回答常用must或have to；否定回答常用neednt。(2)作实义动词need作实义动词时，后可接名词、动名词、不定式等，有人称、时态和数的变化。The bike needs repairing.The bike needs to be repaired.这辆自行车需要修理。3have to与must(1)have to“不得不”，有时态、人称和数的变化
7、，其否定形式为dont/didnt have to。Its too late.I have to go home now.天色太晚了，我现在得回家了。You dont have to finish the work now.你现在没有必要完成这项工作。(2)have to表示一种客观的需要，而must表示一种主观的需要。此外，must还表示“偏要”“非得”的意思。I have to attend an important meeting this afternoon.今天下午我不得不参加一个重要的会议。You must obey the rules of your school.你必须遵守你们
8、学校的规则。4dare的用法(1)dare既可以作实义动词，也可以作情态动词。作情态动词时多用于疑问句、否定句、条件状语从句以及表示怀疑的名词性从句中，表示“敢”。I dare not walk through the wood at night.夜间我不敢在小树林里走。(2)dare作实义动词时，在否定句、疑问句中不定式符号to也可以省略。The children dont dare (to) make a sound while their parents are sleeping.孩子们在父母睡觉时不敢弄出一点声音。Does he dare (to) tell you what he h
9、as done?他敢告诉你们他所做的事情吗？5had better的用法had better后跟动词原形，表示“最好”，其否定式在had better后加not。Youd better get there before it gets dark.你最好天黑前到那。Wed better not talk so loudly.我们最好不要这么大声说话。III.高考链接A.选词填空1As there was no bus，we_ (had to；should) walk home.2I want to go to the office，but you _(need not to go；need no
10、t go) with me.3The manager is so hottempered that I dare not _(to tell；tell) him the bad news.4You neednt _(to fetch；fetch) four；two will do.5I have no bike，so I _(have to go；must go) to the office on foot.6You _(neednt buy；neednt have bought) a gift，but you can if you want to.7I talked with her for
11、 a long time，and eventually I _(could；was able to) make her believe me.8The patient _(can be operated on；has been able to be operated on) by the end of this month.答案：1.had to 2.need not go 3.tell 4.fetch 5.have to go 6.neednt buy 7.was able to 8.can be operated onB.用适当的情态动词或所给动词的正确形式填空1We _ choose b
12、etween staying at home and taking a trip.2Some classmates suggest we _ go to places of interest nearby.3I _ have worried before I came to the new school，for my classmates here are very friendly to me.4I didnt know whether he _ say that to him.5Youd better _ (do) it all by yourself.6Need I hand in my
13、 paper now?Yes，you _ .7The car is so dirty.It needs _(clean)答案：1.can 2.should 3.neednt 4.dared 5.do 6.must 7.cleaning/to be cleanedC.完成句子1I will _ in three years.三年后我将能讲英语。2Im afraid you _such a thing.恐怕你不敢做这样的事。3Do I _my telephone number and address?我有必要把电话和地址留下吗？4Given his health condition，we _.考虑到他的身体状况，我们最好不要让他去那里了。5It was raining outside；we _.外面在下雨，我们不得不待在家里。6If _，please go outside.如果你非得抽烟，请到外面去吸。答案：.be able to speak English.dare not/darent do .need to leave .had better not let him go there.had to stay at home.you must smoke