高中英語外研版選修8 Grammar 情態(tài)動詞復(fù)習(xí)部優(yōu)課件

1、Competition Edison always wondered why hens could hatch (孵) chickens while he was not able to.Question: Are the two modal verbs interchangeable (互換) ? If not, why?1. A big fire broke out in ABC hotel yesterday. Luckily, everyone _ run out of the building.2. She _ speak both English and French.can表示與

2、生俱來的能力或一種客觀可能性，而be able to更加強調(diào)通過后天的學(xué)習(xí)和努力獲得的能力，或者在某個客觀的場合和背景下，能做到的事情?？陀^可能性Can/Could請求和允許 。can/maycant/Im afraid not表示驚異、懷疑、不相信的態(tài)度。（主要用在否定句、疑問句或驚嘆句中） can never/canttoo/enough/more表示“無論怎樣也不過分”，“越越好” 你過馬路的時候再小心也不為過。 You cant be too careful while crossing the road. Mary：Oh, Tom must have smoked here just

3、 now, I can smell it.Tina: Dear me! Didnt he see the sign on the wall? He mustnt smoke here!Mary: If he must, he can go out of the building.Tina: But in my opinion smoking is not a must for him. He could have avoided doing that. Im so tired! I have to do the training for at least 10 hours a day! Obl

4、igation (義務(wù)):Liu Xiang is so gifted in hurdle raceyet he must work hard to win the gold medal.So you must study hard. Although the chance of winning a medal is small, Ill try my best! Shi Dongpeng might win a medal at the Olympic Games.Certainty (可能性)May you succeed. 1.He _ be at home.A. may B. migh

5、t C.must2.He _ be at home, for he just called me from his home 15 seconds ago.A. may B. might C.mustThey_ be doing the experiment in the lab.Why？Because the lights are still burning.must1. 用于表示“意志”“決心” I will offer you any information you need.2. 表示“請求”Will you accept my invitation？3. 表示“總是，習(xí)慣于”He w

6、ill take a walk in the park every day.used towouldused to表示過去的事情， 現(xiàn)在不做would 過去的習(xí)慣動作，與現(xiàn)在無關(guān) shall 用于第二、三人稱肯定句，表示命令，警告，威脅，按規(guī)定 ; What shall we do this evening?用于第一、三人稱疑問句，表示征求對方意見或請求You should keep your promise. 義務(wù)、建議It never occurred to me that she should lie to me again.“竟然”He should be 20 years old.表示推測“照說應(yīng)該”Ability Ob