人教版九年级英语下册《It must belong to Carla》SectionA PPT教学课件(第3课时)，共39页。
Objectives
To learn the words and expressions: laboratory, outdoors, coat, sleepy...
To learn to make inferences by using must, could, might, can’t.
Grammar Focus
Whose volleyball is this?
It must be Carla’s.
She loves volleyball.
Whose hair band is this?
It could be Mei’s hair band. Or it might belong to Linda. They both have long hair.
What did you see that night?
I’m not sure, but it can’t be a dog. It was bigger. I think it might be a bear or a wolf.
Grammar
Use “must” to show that you think something is probably true.
Use “might” or “could” to show that you think something is possibly true.
Use “can’t ” to show that you are almost sure something is not true.
Read the sentences below, paying attention to the colored parts.
— Whose volleyball is this?
— It must be Carla’s. She loves volleyball.
— Whose book is this?
— It must be Mary’s. J.K. Rowling is her favorite writer.
— Whose hair band is this?
— It could be Mei’s.
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，must, might, could, may, can’t, couldn’t.
can和could的区别和用法
1. can表示体力和脑力方面的能力， 或根据客观条件能做某种动作的“能力”。 例如：
►Can you speak English?
►Can you make a cake?
can用在否定句和疑问句中时有时表示说话人的 “猜测”或 “不肯定”。
►Can the news be true?
(在日常会话中，can可代替may表示“允许”，may比较正式。)
2. could 是 can的过去式，表示过去有过的能力和可能性，还有怀疑和不肯定的意思(在否定和疑问句中)。
►She couldn’t skate when she was five years old.（能力）
►At that time we thought the story could be true.（可能性）
could用来提问，是有礼貌的请求 Could.... Please?
语气较为婉转。
►Could I speak to Mr. Smith, please?
might和may的区别和用法:
1. may的用法:
a. 表示“允许”或“请求”。
►May I come in?
在使用这一用法时需注意：may表示“允许”的否定形式是must not，意思是“不应该”，“不许可”。
► —May I take this book out of the reading-room?
—No, you mustn’t．
b. 表示说话人的猜测，认为某一事情“或许”或“可 能”发生。
►He may know the answer．
c. may用在感叹句中可表示祝愿、愿望。
►May you succeed．(祝你成功。)
►May you have a pleasant journey．(一路平安。)
2. might的用法:
a. might可以代替may，表示现在时间的动作，但语气较为婉转客气或更加不肯定。
►Might I take a suggestion？
b. might用来表示现在时间时，还可表示“规劝”。
►You might pay more attention to spoken English．
Homework
Interview more students about the room in activity 4c.
Write their inferences and reasons.
Preview Section B (1a-1d).
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