Unit+1+Food+for+thought+Using+language+学案 高中英语外研版（2019）必修第二册.docx

B2U1 Using languageModals(1)语法感知：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 kitchen!4.we'd better not eat too much roast food as it may make us suffer from heat inside our bodies.5“You needn't try it if you don't want to，” Mum said.Summary:1情态动词有_，但不能_，需和_一起作谓语。2. 情态动词的否定式：_，如：句2,4,5。3. 情态动词后接_。4. 情态动词一般无_和_的变化，个别情态动词有现在时和过去时两种时态变化。 有些情态动词如be able to，have to有 和 的变化，如句1,3。 1can与be able to(1)can只有现在时和过去时(could)两种时态: can-couldbe able to则有更多的时态变化，在非谓语动词中只能用be able to。Will you be able to come to my party tomorrow?Being able to communicate ideas in a meaningful way is a valuable skill.(2)can一般指自身具有的能力，be able to则表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)The girl can't answer the question.If you keep practicing，you will be able to play basketball well.(3)在否定结构中was/were able to与could没有区别She ran fast but she wasn't able to/couldn't catch the bus.2need的用法(1)need作情态动词时，后跟动词原形，表“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.There's plenty of time.You needn't drive so fast.注：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)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。 短语： sb need to do sth. Sth need doing=sth need to be doneYou need _(practice) speaking English more often.My watch doesn't work and needs _(repair).3have to与must(1)have to表“不得不”，有时态、人称和数的变化，其否定式为don't/doesn't/didn't have to。It's too late.I have to go home now.You don't have to finish the work now.(2)have to表一种客观的需要，而must表一种主观的需要。I have to attend an important meeting this afternoon.You must obey the rules of your school.(3)must表“偏偏，偏要，非得”，常指不愉快的事。Must you make so much noise? 4dare的用法(1)dare作情态动词时，多用于疑问句、否定句、条件状语从句以及表怀疑的名词性从句中，表“敢”。I dare not walk through the wood at night.Dare you catch the mouse? No，I daren't.I don't know whether he dare try it.(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.Does he dare (to) tell you what he has done?5had better的用法had better后跟动词原形，表示“最好”，其否定式是在had better后加not。You'd better get there before it gets dark.We'd better not talk so loudly.Practice语段选词填空：I 1._ not read with my eyes painful.My roommate suggested I should have an eye examination.“You 2._ go to the hospital and the doctor 3._ help you find out why，” he said.When I arrived at the hospital，I found many people waiting there.So I 4._ wait for my turn.When it was my turn，the doctor examined my eyes carefully and said，“I 5._ say you don't protect your eyes well.But you 6._ worry about it.Use some medicine and you 7._mustn't make your eyes so tired，and soon you will 8._ recover.” I said to myself，“I 9._ have protected my eyes.”After returning，I told my roommate，“There is nothing serious with my eyes，but from now on I 10._ try to protect my eyes.”学科网（北京）股份有限公司