外研版九年級英語下冊《Language in use》Rules and suggestions PPT教學課件，共38頁。
Learning Goals
通過本課的學習，學生能夠：
①復習鞏固情態動詞的用法
②了解生態旅游
③能給來中國旅游的游客寫一些建議
Warming Up
Imagine you are in a museum. Say what they mean when you see the following signs.
No touching!
You mustn’t touch the things on display.
No photos!
You mustn’t take photos here.
Staff only!
You mustn’t enter the room if you are not the staff of the museum.
No loud talking!
You mustn’t talk with others loudly here.
情態動詞（Modal verbs）
情態動詞表示說話人對動作的觀點，如需要、可能、意愿或懷疑等，不能單獨作謂語，情態動詞與助動詞一樣，后面需要接動詞原形構成謂語，它們一般沒有人稱和數的變化(have to除外)。
常見的情態動詞有can, could, may, might, must, have to, should, shall, would, will, need
(1) can/ could
① 表“能力”（此時could是can的過去式）
I can speak English well now but I could’t 10 years ago.
我現在說英語很好但是十年前我不行。
②表“許可”，可表示請求他人許可或許可他人（could 表示委婉語氣）
—Could I use your bike? —Yes, you can.
③表“推測”
We thought the story could not be true.
It can’t be Mr. Li.
(2) may/ might
①表“許可”，可表示請求他人許可或許可他人（might 表示委婉語氣）
You may sit here if you want.
Might I smoke here?
②表“推測”，可能性推測（might 表示委婉語氣）
She may not like this place.
她可能不喜歡這個地方。
(3) must/ have to
①must表示義務，意為“必須”。在回答must引導的一般疑問句時，肯定回答用must，否定回答用needn’t或don’t have to。mustn’t 表示禁止。
—Must I finish my homework today？我必須今天完成作業嗎？
—Yes, you must. 是的，你必須。
(No, you needn’t./No, you don’t have to.不，你不必。)
②表“推測”，肯定推測
The book must be Lily’s because there’s her name on the cover.
這本書一定是莉莉的，因為封面上有她的名字。
(3) shall/ should
①shall用于第一、第三人稱，表示征求意見或請求指示
用于第二、第三人稱表示“命令”“警告”“強制”“允諾”“決心”
—Shall I let him in?(征求意見，請求指示)
—Yes, you shall.（允諾）
②should表示“應該”，常用來表示勸告、建議, 認為“某人應該做某事”或“有義務責任做某事”。
We should take care of the old.
我們應該照顧好老人。
Possible answers
You must check in at the main gate when you come to the centre.
You should climb with someone.
You must wear a hard hat all times.
You must wear the correct climbing shoes.
You must wear comfortable clothes.
Ecotourism
Ecotourism is also known as “responsible tourism”. It means you visit places without damaging the environment.
Many countries around the world have started ecotourism holidays and trips. Tourists help the local communities look after their natural environment. Here are some rules of ecotourism.
Summary
1. Grammar:
情態動詞（can/could, may/might, must/have to, shall/should）
2. Topic:
Write some advice for visitors to China
learn about ecotourism
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