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《Grammar》公开课PPT课件优质课下载
2. She ___________ speak both English and French.
can表示与生俱来的能力或一种客观可能性，而be able to更加强调通过后天的学习和努力获得的能力，或者在某个客观的场合和背景下，能做到的事情。
客观可能性
Can/Could
请求和允许 。
can/may
can’t/I’m afraid not
表示惊异、怀疑、不相信的态度。（主要用在否定句、疑问句或惊叹句中）
can never/can’t……too/enough/more表示“无论怎样…也不过分”，
“越…越好”
你过马路的时候再小心也不为过。
You can’t be too careful while crossing the road.
Mary：Oh, Tom must have smoked here just now, I can smell it.
Tina: Dear me! Didn't he see the sign on the wall? He mustn't 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.
I’m so tired! I have to do the training for at least 10 hours a day!
Obligation (义务):
Liu Xiang is so gifted in hurdle race…
…yet he must work hard to win the gold medal.
So you must study hard.
Although the chance of winning a medal is small, I’ll try my best!
Shi Dongpeng might win a medal at the Olympic Games.
Certainty (可能性)
May you succeed.