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第七讲 情态动词和虚拟语气 一、情态动词的基本用法 情态动词 用 法 例 句 (1)表示禁止(用于否定句)。 You mustn’t park here！It’s an emergency exit. (2)表必要性意为“必须”。 —Shall I inform him of the change of the schedule right now?must，in case he comes late for the meeting. (3)表示偏执固执意为“非得偏要”。 If you must gountil the storm is over. can和(1)表示“能力”。 —No one can be compared with Yao Ming in playing basketball. (2)表示惊讶常用在否定句和疑问句中。 How could you do such a silly thing？ (3)表示礼貌地请求别人做某事意为“能可以”。 —This dish is really delicious.Could you please say it in Chinese? (4)cannot...too/ enough表示“无论……也不过分”；“越……越好”。 You can’t be too careful while driving. (1)用于第一、第三人称疑问句中表示说话人征求对方的 Shall I go out for a walk after supper? (2)用于第二、第三人称陈述句中表示说话人给对方的命令、警告、允诺或威胁。 —Will you read me a storyshall have one if you go to bed as soon as possible. may和(1)may和might表示“许可”、“可能性”、“祝愿”等意义。 —May I take this book out of the reading room? (2)“may as well＋动词原形”意为“最好倒不如”。 If you think the price of beef is too highmay as well buy some pork.It depends on you. | 
