优化课堂2012高一英语精品课件：UNIT 2 SECTION Ⅱ LEARNING ABOUT LANGUAGE （新人教版必修3）.ppt

1、Section Learning about LanguageHowever,as she was so afraid of being laughed at by herfriends,she did not consult a doctor but lived on a diet of rice,raw vegetables,bananas and lemons.但是，因为她害怕被朋友们嘲笑，她没有咨询医生，而是吃米饭、生蔬菜、香蕉和柠檬。1consult vt.咨询；请教；商量；查阅(词典、参考书等)典例 He went to the town to consult his doctor

2、.他进城去咨询医生。Ill do nothing without consulting you.我采取行动之前一定和你商量。He consulted his notebook repeatedly during his speech.他演讲时不断地看他的笔记本。拓展 consult sb.about sth.向某人咨询某事consultant n顾问运用 完成句子I suggest he _(请教律师关于)the matter.You can _(查字典)for the placenames.He is an art _(顾问)consult the dictionaryconsult a l

3、awyer aboutconsultantWell,you have to eat food with plenty of fibre that helpsyou digest better.哦，你应该吃富含纤维素的食物，这样能帮助你更好地消化。2digest vi.&vt.消化；领悟 n摘要；概要典例 Cheese doesnt digest easily.奶酪不易被消化。I have digested most of the important points in the book.我已经领悟了书里的大部分要点。This is a digest of the weeks news.这是一周

4、的新闻摘要。运用用 digest 的适当形式填空Protein _ slowly.It took me some time _ what I heard.This is a _ of the meeting.digeststo digestdigest情态动词一、ought to 的用法ought 无人称和时态的变化，后接带 to 的动词不定式。ought to 意为“应该”、“应当”等。其主要用法有：1用于第一人称，表示有责任或有必要去做某事，与should相比，语气更强。如：We ought to be more careful with our homework.我们应当更加认真地对待作

5、业。2用于第二、三人称，表示建议或劝告。如：You ought to follow Mr.Wangs advice.你应当听王老师的建议。3表示对现在或将来某种可能性的推测，并且这种推测是可信的。如：Henry ought to be here soon.He left home at six.亨利应该很快就到，他六点就从家里出来了。4ought to 的否定形式是在 ought 后面直接加 not，疑问形式是将 ought 提到句首。如：He ought not to do it./He oughtnt to do it.他不应该做那件事情。Ought we to take actions

6、at once?我们应该立即采取行动吗？5在反意疑问句中，含有 ought 的反意疑问可以用 shouldnt或 oughtnt。如：He ought to be here,shouldnt/oughtnt he?他应该在这儿，不是吗？6ought to 后接动词的完成式，表示过去应该做而实际上并未做，意为“早应该，本应该”。若是否定句，则表示本不应该做而实际上却已经做了。如：Im sorry.I ought to have phoned to tell you I was coming.对不起，我本应该先给你打个电话告诉你我来了。二、have to 与 must 的区别1两者都可意为“必须”

7、、“应该”，但 have to 表示客观的需要，而 must 表示说话人主观上的看法，即主观上的必要。如：My brother was badly ill,so I had to call the doctor atmidnight.我弟弟病得很厉害，我只得半夜把医生请来。(客观上需要做这件事)He said that they must get up at midnight.他说他们必须半夜起床。(主观上要做这件事)2have to 有人称、数和时态的变化，而 must 只有一种形式。如：He had to look after his sister yesterday.昨天他必须照顾他的妹

8、妹。She must return home at once.她必须马上回家。3在否定结构中，dont have to 表示“不必”，mustnt 表示“禁止”、“不许”。如：You dont have to tell him about it.你不必把此事告诉他。You mustnt tell him about it.你不许把这件事告诉他。4在回答 must 的一般疑问句时，肯定式常用 must，表示“必须”，否定式常用 need not(neednt)或 dont have to，表示“不必”。如：Must I be home before nine oclock?我必须九点之前回家吗？

9、Yes,you must.是的，你必须。No,you neednt/dont have to.不，你不必。三、情态动词 need 的用法情态动词 need 表示“需要”、“必须”，无人称、数和时态的变化，其否定式为 need not 或 neednt。情态动词 need 通常用于疑问句和否定句中，或与条件句，whether,hardly,nobody等连用。如：Need he go so soon？他需要这么快就走吗？He neednt go.他不必走。If she wants anything,she need only ask.她想要什么，只需说一声就行。He wondered wheth

10、er they need go there.他想知道他们是否需要去那里。Nobody need be afraid of catching the disease.谁都不用害怕得这种病。注意：(1)由于情态动词 need 不能用于肯定句，因此其肯定回答要用 must。如：Need I stay here any longer?我需要在这儿再待下去吗？No,you neednt.不，你不需要。Yes,you must.是的，你需要待下去。(2)neednt have done 表示“本来不必做某事但实际上却做了”。如：She neednt have come in persona call wo

11、uld have beenenough.她本不必亲自来打个电话来就足够了。Need you have paid so much?你当时真的需要付那么多钱吗？注意：need 一般不用其完成时的肯定式(need have done)，而用 should/ought to/could have done。用 must,have to,ought to,need 的适当形式填空1One _ eat to live.has to2 You _ smoke in this part of the hospital.Itsnonsmoking.mustnt3 You _keep a simple first

12、 aid box at home for anyaccident.ought to4If she is completely well,she _ return to school today.5You _ have finished the article.The deadline islast Friday.ought toSorry.I have been busy these days.Could you give meanother three days?ought to6 He _ have caught a bad cold last night,for hisforehead felt burning.7They _ worry about it.Everything will be better.8Three months ago my husband got a new job in another city,so we _ move again.9_ I hand in my exercise book today?No,you dont have to.10 She _ have gone to the station to meet him lastnight,but she did.mustneedntMustneednthad to