新目标(Go for it)版九年级全Unit 5 It must belong to Carla.Section A（1a--1c）Period

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Unit 5
It must belong to Carla
Can you guess what it is
It could be _________________.
It also might be ______________.
a white vase
two faces
It could be
___________.
It also might be
___________.
Can you guess what it is
a dog
two girls
Could A be bigger than B
In fact, A and B must be ___
________________.
Which one is bigger, A or B
A
B
the same size
No.
表示推测的情态动词
在英语中，表示对某件事物的确定程度，即表示推测的时候，我们通常会用到以下情态动词表示推测：must, might, could, may, can’t.
确信程度大小：must〉 may > might
肯定和否定的推测：
must（肯定） can’t， couldn’t (否定）
Learn to make inference
must
can’t
could
might
100%
probably true
20%-80%
possibly true
0
almost not true
Learn to make inference
程度 肯定句 否定句 疑问句
must ★ ★ ★ ★ √
may ★ ★ ★ √ √
might
/could ★ ★ √
√
√
√
can’t
can ★
√
√
1 . must用在肯定句中表示较有把握的推测，意为“一定”。(100%)
He must be working at home.
must 表示对已发生的事情的推测时，must 要接完成式 .
The road is wet. It must have rained last night
2. can用在否定句或疑问句中时表示说话人的“推测”和“不确定”
例如：1.Where can he be
2.It may be the headmaster.
No, it can’t be him. He has gone to shanghai.
could 也有怀疑和不确定的意思（在否定句中和疑问句中）
例如：1. At the time, we thought the story could be true.
2. He couldn't be a bad man
3.may 表示说话人的猜测，认为某一事情“或许”或“可能”发生。
There may be a terrible storm in the following few days.
might 表示推测时，不表示时态。只表示可能性更小。
He might be at home.
1. 这本书一定是李雷的。他正在找这本书。
This book _____be Li Lei’s. He is looking for it.
2. 这个发带可能是韩梅的。她喜欢戴发带。
The hair band ______be Han Mei’s. She likes wearing a hair band.
must
could
Practice
3. 这个玩具熊可能是约翰的妹妹的。
她还是个小姑娘。
The toy bear ________belong to John’s sister. She is a little girl.
4. 这个排球不是玛丽的。她根本不喜欢排球。
The volleyball ______be Mary’s. She doesn’t like playing volleyball at all.
might
can’t
Listening and speaking (1b: P34)
is her favorite author.
1. Jane’s little brother
toy car
He was the only little kid at the picnic.
2. Mary
book
Hemingway
listens to classical music.
3. Carla
volleyball
She loves volleyball.
4. Deng Wen
magazine
He loves cats.
5. Grace
CD
She always
Summary （小结）
情态动词表示推测：
（1）must常用于肯定句中，意为“准是、一定”，它表达的肯定程度最大，可以达到100%。
（2）could、might、may的意思是“可能、也许”，表示推测，它们所表达的肯定程度较低，这三个词相比may的可能性稍大一些；他们的肯定程度在20%至80%。
（3）can’t的意思之“不可能”，它相应的肯定形式是must；它的可能性为0% 。
（4）must、could、might和can’t的后面可用一般现在时、现在进行时，表示对现在的动作、状态或正在进行的动作的推测。
例：He might/could be playing basketball now.
他现在可能正在打篮球。
I’m sure that she can’t stay at home.我确信她不在家。
He must be walking in the garden.他肯定在花园里散步。