Unit 1 Food for thought Part Ⅱ Using language——情态动词(1)（学案）-【状元桥·优质课堂】2021-2022学年新教材高中英语必修第二册（外研版）

Unit 1 Food for though B.否定式:don't( doesn't)+ have to+动词原形 He needn' t worry about it.这件事他无须担心。 You don' t have to go if you dont want to Need he do this homework first? 如果你不想去,你就不必去 他需要先做这些作业吗? He doesn't have to stay at home all day (2)在否定句中,可以用“need的否定形式+完成式”表示 他不必整天待在家里 “本不必做某事而实际上做了”。 (2) have to的一般疑问句形式及简略答语 We needn' t have worried.其实我们不必担心。 have to的一般疑问句形式必须借助助动词do或does You needn't have mentioned it >Do you have to look after your sister? 你本来不必提起这件事 你得照看你妹妹吗? (3)其一般疑问句的答语,肯定用must,否定用 needn't Yes, I do. /No, I don eed I go with her?我需要和她一起去吗? 是的,我得照看。/不,我不必照看。 Yes, you must.是的,你需要去。No, you needn't. Does Jim have to do his homework? 不,你不必去。 吉姆必须做家庭作业吗? [名师指津]need作为实义动词时,通常用法是 Yes, he do (1)人+need+todo 是,他必须做。/不,他不必做 (2)物+need+ doing (3)物+need+ to be done (3) have to的特殊疑问句形式 We need to get enough help.我们需要大量的帮助。 what do you have to do on Sundays? The room needs cleaning. =The room needs to be cleaned 在星期天你得干什么? 房间需要打扫了 Why does she have to move to Paris? 即学活用]—补全句子 她为什么得迁往巴黎? 1.他们需要填表吗? 名师指津] have to表示客观需要做的事情,意思是“必 in the form? 须,不得不”。后跟动词原形,有人称、时态和数的变化。2.星期天我们不用去上学 W (1)意为“最好,应该”,后接动词原形,与情态动词 should school on Sundays. 用法相似,其中的had通常缩略为'd。 3.考虑到他的身体状况,我们最好不要让他去那里了 > We had better finish the task before friday Given his health condition, we 我们最好在周五之前完成任务 2 had better构成否定式时,通常将not置于 had better:4.这里很温暖,我们还不必开暖气。 之后(而不是had之后);而构成疑问式时,则通常将had It's quite warm here; we the heating 而不是 had better)置于主语之前。 on yet. I had better not disturb him.我最好别去打扰他。 未经你老师允许,你怎么敢进实验室? What had we better do?我们最好怎么办? 名师指津]在否定疑问句或反意疑问句中可将not与had without your teachers permission? 连用:Hadn' t we better go now?我们是不是现在就去呢? 6.在消防队员的帮助下,那个女孩能够从火里逃出来。 With the firefighters' help, the girl (1)need表示“需要”或“必须”,通常用于否定句、疑问句、 条件句 随堂检测·素养达标 答案精解P1s1 I.写出加黑词汇的汉语意思 4.你没必要走得太快 1. You needn' t hand it in at once, and you may hand it in:5.只有这样你才不会太累。你才能实现下一个目标 tomorrow 2. You had better go now. It's getting late. 3. Looking at my determined face, the big boy dare not pick 4. It's too late; I have to go hom