Unit 4 A good read
Grammar
知识点:
疑问词 + 动词不定式
我们可以用“疑问词 +动词不定式”结构作动词的宾语。
疑问词包括疑问代词what、which、who和疑问副词how、when、where等。常和“疑问词+动词不定式”结构连用的动词及动词短语有:know、learn、see、hear、ask、tell、advise、decide、explain、find out、forget、remember、think、understand、wonder等。
I do not know what to say next.
I cannot decide which to take.
有些动词,如advise、ask、show、teach、tell等,其后可以接双宾语。
Please tell me how to get there.
Sandy showed Millie how to start the online tour.
有些疑问词,如what、which、whose、how many、how much等,其后可以先接一个名
词,再接动词不定式。
She wondered how many subjects to choose.
在“疑问词+动词不定式”结构前,有时也可以是如sure、clear等的形容词。
I am not sure which way to take.
“疑问词+动词不定式”结构在句子中还可以作主语和表语。
How to deal with the problem is most important to us.
The problem is when to leave the place.
“疑问词+动词不定式”结构可以改写成由该疑问词引导的从句。
I do not know what to do.
= I do not know what I should do.
【注意】所有疑问词中,只有why不可以与动词不定式连用;若动词不定式的动词为不及物动词,需要加上后面的介词。
Daniel did not say who to talk to about this book.
I don’t know who to turn to for help when I have problems.
must/have to的用法
must表示主观的义务和必要,主要用于肯定句和疑问句,意思是“必须,得,要”。
You must finish your homework today.
must的否定形式must not表示禁止,意思是“不能,不许”。
You must not smoke here.
must 还可以表示肯定猜测,意思是“一定”。
You must be hungry after all that walking.
have to表示一种客观的需要,意思是“不得不”。have to有人称和数的变化。
It is getting dark. He has to go home now.
Mum is out, so I have to look after the shop.
have to的否定形式是do not have to。
They do not have to buy a computer at the moment.
He does not have to go.
【注意】Must引导的疑问句可以用don’t have to/ needn’t来回答。
Must I finish my homework now
No, you don’t have to/ needn’t.
同步练习
一、根据句意及中文提示或首字母完成单词
1. He_______(to succeed in doing sth.) the difficult work without help.
2. I will wait_______(up to the point in time) I hear from you.
3. There is something wrong with these children’s_______(胃). We need to call 120 at once.
4. Though she was a_______(极小的) girl, she had a very loud voice.
5. Jim looks all_______(遍及) his house for his new book.
答案:1. managed 2. until/till 3. stomachs 4. tiny 5. over
二、用must/have to的适当形式填空
1. You_______wait a long time for a bus because it is foggy today.
2. When you go abroad, you_______take care of yourself.
3. You_______not get off until the bus stops.
4. You_______tell your parents when you play football outside late.
5. My bike was broken, so I_______go to school on foot.
答案:1. have to 2. must 3. must 4. must 5. had to
三、选择所给单词的适当形式填空
break, interest, manage, go, knowledge
1. We can improve our_______of grammar by playing this game.
2. The boat crashed against a rock and_______into pieces.
3. Students do not have to_______to school at the weekend.
4. I found this book_______and I have read it many times.
5. -I_______to host the show for New Year’s Day yesterday.
-Congratulations.
答案:1. knowledge 2. broke 3. go 4. interesting 5. managed
四、单项选择
( ) 1. The doctors and nurses managed_______the lives of patients, though they didn’t have enough medicine.
A. save B. saving C. to save D. to saving
( ) 2. According to the new traffic rules, people_______wear a helmet when riding an e-bike.
A. might B. may C. can D. must
( ) 3. -There are five films on at the cinema today. I can’t decide_______.
-Why not watch Alice Through the Looking Glass It’s amazing.
A. what to choose B. what should I choose C. which one to pick D. which one should I pick
( ) 4. -You_______take photos here! Look at the sign. It says “No photos”.
-Sorry, I won’t.
A. must B. need C. mustn’t D. needn’t
( ) 5. Doctors in the town are using books_______their studies and treat patients.
A. continue B. to continue C. continuing D. continues
答案:1-5 CDCCB
五、根据汉语提示完成句子
1. 我们计划去北京,但还没决定何时去。
We are planning to go to Beijing, but we haven’t decided________________.
2. 明天的社会实践每个人都要准时参加。
Everyone is supposed to be___________________for the social practice tomorrow.
3. 你能告诉我怎样处理这辆旧自行车吗?
Can you tell me_________________________
4. 在课堂上你必须认真听老师讲课。
You______________________________in class.
5. 因为在下雨,我不得不乘公共汽车回家。
I_______________________, because it is raining.
答案:1. when to go 2. on time 3. what to do with the old bike/how to deal with the old bike
4. must listen to the teacher carefully 5. have to take a bus home