人教版九年級英語下冊《It must belong to Carla》SectionA PPT教學課件(第3課時)，共39頁。
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.
表示推測的情態(tài)動詞
在英語中，表示對某件事物的確定程度，即表示推測的時候，我們通常會用到以下情態(tài)動詞，must, might, could, may, can’t, couldn’t.
can和could的區(qū)別和用法
1. can表示體力和腦力方面的能力， 或根據(jù)客觀條件能做某種動作的“能力”。 例如：
►Can you speak English?
►Can you make a cake?
can用在否定句和疑問句中時有時表示說話人的 “猜測”或 “不肯定”。
►Can the news be true?
(在日常會話中，can可代替may表示“允許”，may比較正式。)
2. could 是 can的過去式，表示過去有過的能力和可能性，還有懷疑和不肯定的意思(在否定和疑問句中)。
►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用來提問，是有禮貌的請求 Could.... Please?
語氣較為婉轉(zhuǎn)。
►Could I speak to Mr. Smith, please?
might和may的區(qū)別和用法:
1. may的用法:
a. 表示“允許”或“請求”。
►May I come in?
在使用這一用法時需注意：may表示“允許”的否定形式是must not，意思是“不應該”，“不許可”。
► —May I take this book out of the reading-room?
—No, you mustn’t．
b. 表示說話人的猜測，認為某一事情“或許”或“可 能”發(fā)生。
►He may know the answer．
c. may用在感嘆句中可表示祝愿、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，表示現(xiàn)在時間的動作，但語氣較為婉轉(zhuǎn)客氣或更加不肯定。
►Might I take a suggestion？
b. might用來表示現(xiàn)在時間時，還可表示“規(guī)勸”。
►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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