lish _____ be difficult.canMan can not live without air._______ I use your bike?Cancan/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 _____CouldHe asks if he ____ smoke here.couldcan/maycan’t/I’m afraid notcan/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 mit 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与生俱来的能力或一种客观可能一种客观可能,而be able to更加强调通过后天的学习和努力获通过后天的学习和努力获得的能力,得的能力,或者在某个客观的场合和背景下在某个客观的场合和背景下,能做到的事情。
全文预览