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情态动词的用法 情态动词的基本用法特点 1） 情态动词 除 ought 和 have 外，后面只能接动词 原型。 2） 情态动词没有人称，数的变化，即情态动词第 三人称单数不加-s。 3） 情态动词没有非谓语形式，即没有不定式，分 词，等形式。 高中阶段都学过哪些情态动词呢 1 can / could / be able to 2 may/might 3 must / have to 4 shall / should 5 will / would 6 need / dare 7 ought to 1 can / could / be able to 1 Some of us can use computers now, but we couldn't last year.（能力） 2 It will be sunny in the day time ,but it can rain later on this evening（客观可能性） 3 ---Can I go now ? yes ,you can （请求和允许） 4 Could you wait a few days for the memory? （请求） 5 1 Can this news be true? 2 It can't be our headmaster.he has gone to Beijing.（表推测，主要用于否定和疑问） *be able to 能用于各种时态。 can / could 只能表示现在或过去的能力。 *was / were able to : “设法做成某事” 相当于 managed to do sth. succeeded in doing sth.。 1. can 与be able to 有何区别？ 1. A computer ______ think for itself; it must be told what to do. | 
