英语必修 第二册Unit 1 Food for thought优秀课件ppt

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Unit 1　Food for thought
PART 1
语法导学
PART 2
达标检测
Period Four　Grammar—Modals(1)
PART 1
语法导学
感悟规律 重点难点剖析
感知以下课文原句，完成方框下的小题
◆语法感知
Choose the meanings to the words in blue above.A.Be afraid to do something.B.Not be necessary to do something.C.Give advice to do or not to do something.D.Be necessary or give strong advice to do something.E.Have the ability to do something.1. 　2. 　3. 　4. 　5. ___
E
A
D
C
B
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。
◆语法精析
3.构成否定句时，not放在其后面。The young man can’t 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1.can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could没有区别。This time I failed in the exam，but I’ll 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 couldn’t/wasn’t able to catch the bus.她跑得很快可还是没能赶上公交车。
2.need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，you needn’t.——我需要今天干完这活吗？——是的，你必须干完。/不用，你不必干完。There’s plenty of time.You needn’t 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needn’t。
(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。
3.have to与must(1)have to“不得不”，有时态、人称和数的变化，其否定形式为don’t/didn’t have to。It’s too late.I have to go home now.天色太晚了，我现在得回家了。You don’t 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.你必须遵守你们学校的规则。
4.dare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 don’t 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 has done?他敢告诉你们他所做的事情吗？
5.had 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。You’d better get there before it gets dark.你最好天黑前到那。We’d better not talk so loudly.我们最好不要这么大声说话。
PART 2
达标检测
当堂检测 基础达标演练
1.We choose between staying at home and taking a trip.2.Some classmates suggest we go to places of interest nearby.3.I have worried before I came to the new school，for my classmates here are very friendly to me.4.I didn’t know whether he say that to him.5.You’d better (do) it all by yourself.6.—Need I hand in my paper now?—Yes，you .7.The car is so dirty.It needs (clean).
Ⅰ.用适当的情态动词或所给动词的正确形式填空
can
should
needn’t
dared
do
must
cleaning/to be cleaned
8.I will in three years.三年后我将能讲英语。9.I’m afraid you such a thing.恐怕你不敢做这样的事。10.Do I my telephone number and address?我有必要把电话和地址留下吗？11.Given 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。12.It was raining outside；we .外面在下雨，我们不得不待在家里。13.If ，please go outside.如果你非得抽烟，请到外面去吸。
Ⅱ.完成句子
be able to speak English
dare not/daren’t do
need to leave
had better not let him go there
had to stay at home
you must smoke