高中语法情态动词公开课课件(共37张PPT)

can/could: 1. can 一般表示与生俱来的能力或者一种客观可能性,还可以表示请求和允许 。 Learning English _____ be difficult. can Man can not live without air. _______ I use your bike? Can can/could: 2.在疑问句中，用could可表示请求，语气较委婉。 — ____I have the television on? — Yes, you _____. / No, you _____ Could He asks if he ____ smoke here. could can/may can’t/I’m afraid not can/could: 3.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） He’s such a nice person that he ______ commit the crime. can’t 你怎么会如此地粗心！ How can you be so careless! Can this be true? can/could: 4. can never/can’t……too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. can/be able to区别: Edison always wondered why hens could hatch (孵) chickens while he was not able to. Question: Are the two modal verbs interchangeable (互换) ? If not, why? can表示与生俱来的能力或一种客观可能，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。 can/be able to区别: A big fire broke out in ABC hotel yesterday. Luckily, everyone __________ run out of the building. was able