2017届高考英语二轮语法专题课件：专题6 情态动词_高考复习指南

2017届高考英语二轮语法专题课件：专题6 情态动词

　　②He shall go first，whether he wants or not. ③This law shall come into effect on May lst. should 表示劝告和建议，作“应该”讲 You should learn from each other. 表示惊讶、意外等情绪，意为“竟然” I can't bear that he should speak ill of me. 用在if条件句中，表示可能性很小，但也不是完全不可能 If anyone should come，say I'm not at home. 情态动词主要用法典句例示 will/ would 用于表示意志或意愿 I have told him again and again to stop smoking，but he will not listen. 表示“请求；建议”。用would比will委婉、客气些 Would you like some more coffee？表示习惯：will可以表示现在的习惯，意为“总是；习惯于”。表示过去的习惯性动作用would ①She will sit for hours reading in the afternoon.

　　②When he was young，he would listen to music alone in his room. 表示事物的某种性质和倾向 Wood will float on the water. need 表示“需要；必要”，用于否定句、疑问句和条件从句中 —Need we take the test？—No，we needn't. dare 表示“敢；敢于”，主要用于疑问句、否定句和条件从句中，一般不用于肯定句。I dare say是习惯说法，意为“我想，大概” How dare you talk like that？ ought to 表示义务，意为“应当”，语气比should强，表示不十分肯定或含蓄的推测，意为“应是，应该 ” ①Everyone ought to obey the traffic regulations. ②He ought to be home by now. 二、3组易混情态动词用法比较情态动词主要用法典句例示 can(could)/ be able to can/ Could can只有现在式和过去式could，表示一般能力 I am starving to death.I can eat two bowls of rice. be able to 有更多的形式，was/were able to表示通过努力、克服困难做成某事 The fire spread through the hotel very quickly but everyone was able to get out. must/have to must 侧重表示说话人的主观看法；只有一种形式 We must rely on ourselves. have to 表示客观需要，有不同的形式 I have to give it up because of my illness. would/ used to would 表示过去习惯性或重复性的动作，没有与现在对比的含义，不可用于无人称句或存在句 Last year，our English teacher would sometimes tell stories after class. used to 表示过去经常发生的动作或存在的状态，强调今昔对比，可用于无人称句或存在句 He told us he used to play football when he was young. 考点警示 (1)can的一些常用固定搭配cannot but do sth/cannot help but do sth/cannot choose but do sth表示“不得不，只好” cannot/can never...enough/too再……也不为过 (2)may的一些常用固定搭配 may well＋动词原形意为“完全能，很可能”，may as well＋动词原形意为“最好，满可以，倒不如” (3)mustn't表示“禁止”“不许做某事” 回答用need提问的问句时与回答用must提问的问句时一样，肯定回答用must，否定回答要用needn't或don't have to。 ①I cannot choose but go.