M4Unit2Grammar.ppt

翻译句子;Modal words;基本用法;be able to 除了可以与can互用表示能力以外，还可以指经过努力而 成功地办到了某个具体的事情，相当于manage to或者succeed in, 不可以用can。 My brother can play table tennis. He was able to flee from the prison. Despite his enormous workload the President still seems able to find time to go fishing. I havent been able to read that report yet. She couldnt climb the mountain.(没有能力爬，因此也没爬) She was not able to climb the moutain.(尝试爬过，但没能爬上去);2) 表示许可或者请求许可（正式场合用may）Can you help me to work out this maths problem?You can borrow two books at a time from the library. 3）表示可能性，用于推测，常用于疑问句和否定句中,指“某事是否是事实”（肯定句中要用may) Can it be true?----It can be true. Can he be so selfish? Can he be living there? Can the hall seat a thousand people?