高一【英语(外研版)】必修二 Unit Let‘scelebrate(2)-课件

Summarizing
must+ 完成式 表示对已发生情况的推测，通常用于肯定句。
She must have gone home.
can+ 完成式 表示对已发生情况的推测，通常用于否定句或疑问句。 a. You can’t have forgotten her. b. Where can she have put it?
Practicing
2. It’s possibly him. It may/might/could be him.
3. I’m sure that’s Lucy. That must be Lucy.
Practicing
4. I don’t think that’s Lucy. That can’t be Lucy.
Analyzing
1. What do the words in yellow indicate: an order, a request, ability or possibility?
The words in yellow indicate possibility.
Analyzing
2. Will the meaning of sentence (a) change if we replace “could” with “must” or “might”?
Practicing
Rewrite the underlined sentences in the conversation in Ex. 2 on page 17 using can/could, may/might, and must.
Practicing
1. I expect you are feeling tired now! You must be tired now!
The children must have been very excited as they opened it.
Review and answer
3. What is the unusual part of the book?
Interestingly, the letters didn’t contain the usual warnings to children that they might not receive their presents if they were not good.
As a human being, anyone can make a mistake.
2. 用于否定句或疑问句，表示对现在的动作或状态进行主观的猜测，意为 “可能”，或表示惊异、怀疑等态度。
He can’t have a lot of money.
Summarizing
may+ 动词原形 表示主观的推测，意为“或许”，用于肯定句和否定句均可。
Review and answer
●Review the reading passage and answer the following questions.
●1. Which book is a good choice for those who regard Christmas as a special time of year?
Analyzing
1. Who could it be from? 2. The letters were also beautifully illustrated—each must have taken its true author, Tolkien, a long time to complete. 3. By expressing love for his children in such a special way, Tolkien may indeed have been the real Father Christmas.
Discovering
Look at the following sentences first.
a. That is why Letters from Father Christmas could be the perfect book for those who regard Christmas as a special time of year. b. The children must have been very excited as they opened it. c. … they might not receive their presents if they were not good.
5. Maybe they are from our school. They may/might/could be from our school.
Application
Look at the picture in Ex.3 on page 17 and answer the question: What is the picture about?
●2. What’s the feeling of the children when they received letters from North Pole?
●3. What is the unusual part of the book?
Review and answer
1. Which book is a good choice for those who regard Christmas as a special time of year?
It shows a scene on Black Friday. Black Friday refers to the day after the US Thanksgiving holiday and is one of the busiest shopping days of the year. Stores have big sales and open their doors very early. It is considered as the start of the holiday shopping season.
Analyzing
3. What happens if we change “must” and “might” in sentences (b) and (c) into “could”?
If we change “must” in sentence (b) into “could”, it means the speaker is not sure about the statement, and it’s only a possibility.
If we replace “could” with “must”, the meaning of sentence (a) will change. It means the speaker is quite sure about the statement.
If we replace “could” with “might’, the meaning of sentence (a) will remain more or less the same. “Could” and “might” in affirmative sentences have a similar meaning when indicating possibility.
Summarizing
Work in groups and summarize the usage of the modals “can/could, may/might, must”.
Summarizing
can+ 动词原形
1. 用于肯定句，表示客观可能性，意为“可能”，即从理论上看是可能 的，但不一定会发生。
Summarizing
could+ 完成式 表示对过去情况的推测，多用于否定句或疑问句。 a. He could not have been more than 16 at that time. b. Could she have forgotten my address?
may/might+ 完成式 表示对已发生事情的不肯定的推测，might比may语气更加不肯定。 He may/might have come by train.
a. They might have a lot of work to do now but I’m not sure. b. She was afraid they might not like the idea.
Summarizing
could+ 动词原形 意为“可能”，可以指过去的情况，也可以指现在的情况，语气缓和。多 用于否定句或疑问句。
Letters from Father Christmas could be the perfect book for those who regard Christmas as a special time of year.
Review and answer
2. What’s the feeling of the children when they received letters from North Pole?
If we change “might” in sentence (c) into “could”, it means it’s impossible for the children to receive their presents.
Analyzing
Read the passage again to find all the sentences containing modal verbs and figure out the meanings of these words.
北京市中小学空中课堂
必修二 Unit 2 Let’s celebrate (2)
高一年级 英语
主讲人 丁若理 北京师范大学良乡附属中学
Using language Modals (2) Grammar
●At the end of the class, you’ll be able to:
●1. summarize the basic usage of the modal verbs which
AnalyziΒιβλιοθήκη g1. What do the words in yellow indicate: an order, a request, ability or possibility? 2. Will the meaning of sentence (a) change if we replace “could” with “must” or “might”? 3. What happens if we change “must” and “might” in sentences (b) and (c) into “could”?
indicate Lpoessaibrilitnieisng Objectives
●2. use “can/could, may/might, must” to rewrite sentences in real conversation
●3. use modal verbs indicating possibilities to describe people in a picture and give proper reasons when necessary
a. He may be very busy now. b. He may not be at home.
表示可能性时，can’t 语气较强，表示“不可能”； may not 语气较弱，表示“可能不，或许不”。
Summarizing
might+ 动词原形 表示推测，意为“可能”，可以指过去的情况，也可以指现在的情况，但 语气比may更加不肯定。用于肯定句和否定句均可。
a. He looks young. He couldn’t be over 50. b. Could it be true?
Summarizing
must+ 动词原形 表示猜测，意为“准是，一定”，通常用于肯定句。
a. This must be your room. b. Look at his new car. He must have a lot of money.