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仁爱英语 资源共享:情态动词用法

归纳总结:情态动词用法
情态动词表示说话人对某一动作或状态的态度,或表示主观设想。情态动词有自己的词义,但不能单独作谓语动词,必须和后面的动词连用构成谓语,没有人称和数的变化。常用的有can, may, must, need等。情态动词是中考测试的重点,准确把握情态动词在具体语境中所表达的意义至关重要。
一、can的用法1.表示能力,有"能"、"会"、"能够"的意思。例如:Can you drive a car? 2.表示可能,常用于否定句或疑问句。例如:Can it be true? Today is Sunday. He can't be at school today. 3.表示允许,口语中代替may,有"可以"的意思。例如:You can use my car. 4.can和be able to 的区别:can表示能力时,可以用be able to代替;can只有can和could两种时态,而be able to可用于其他时态;be able to强调"通过努力有能力做到",如果表示"某事已经成功"应用 be able to,而不用could。例如:He was able to leave Europe before the war began.二、may的用法1.表示许可(否定回答用can't或mustn't)。例如:-May I take the magazine out of the reading room?-No, you can't (mustn't).2.表示可能,通常只用于陈述句中。例如:It may rain this afternoon. 3.表示祝愿,用于祈使句中。例如:May you have good luck!三、must的用法1.表示必须、应该(否定形式用needn't或don't have to )。例如:-Must I finish the work before dark?-No, you needn't / don't have to. You may leave it for tomorrow.2.must not (mustn't)表示强烈禁止。例如:You mustn't get to school late.3.表示推测,只用在肯定句中,"一定"、"想必"之意。其否定意义"不可能",用can't be形式。例如:-The light in her room is still on; she must be at home now.-She can't be at home. I saw her out just ten minutes ago. She forgot to turn off her light.4.must和have to的区别:must表示说话人的主观看法;而have to强调客观情况迫使人不得不……;must只能表示现在"必须",表示过去的事情要用had to;have to有时态、人称和数的变化。must和have to的否定意思不同。比较: You mustn't do that.(你千万不能做那件事。) You don't have to do that.(你不必做那件事情。)四、 need的用法need作情态动词时表示"需要",主要用于否定句和疑问句。例如:-Need we finish the work today?-Yes, you must. / No, you needn't.

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