2017届高三英语一轮语法专项学案：第7节 情态动词和虚拟语气
<p> 第七节 情态动词和虚拟语气</p><p> (对应学生用书第252页)</p><p> 考点一 情态动词的基本用法</p><p> 1．<span word="can">can</span>的用法</p><p> (1)表示能力。需注意的是，<span word="could">could</span>表示过去一般的能力，而<span word="was">was</span>/<span word="were">were</span> <span word="able">able</span> <span word="to">to</span>表示有能力而且成功地做成了某事。</p><p> <span word="The">The</span> <span word="fire">fire</span> <span word="spread">spread</span> <span word="through">through</span> <span word="the">the</span> <span word="building">building</span> <span word="very">very</span> <span word="quickly">quickly</span>, <span word="but">but</span> <span word="everyone">everyone</span> <span word="was">was</span> <span word="able">able</span> <span word="to">to</span> <span word="get">get</span> <span word="out">out</span>.尽管这场大火迅速蔓延了整个大楼，但是每个人都逃了出去。</p><p> (2)表示理论上的可能性，意为“有时候可能会”。</p><p> <span word="Everything">Everything</span> <span word="can">can</span> <span word="happen">happen</span>, <span word="everything">everything</span> <span word="is">is</span> <span word="possible">possible</span> <span word="and">and</span> <span word="probable">probable</span>.</p><p> 任何事情都有可能发生， 没有什么是不可能的。</p><p> (3)表示请求和允许。在问句中，<span word="could">could</span>比<span word="can">can</span>语气要委婉。</p><p> —<span word="Could">Could</span> <span word="I">I</span> <span word="use">use</span> <span word="your">your</span> <span word="bike">bike</span>? 我可以用你的自行车吗？</p><p> —<span word="Of">Of</span> <span word="course">course</span> <span word="you">you</span> <span word="can">can</span>. 当然可以。</p><p> (4)表示推测，常用于疑问句和否定句。</p><p> <span word="What">What</span> <span word="can">can</span> <span word="they">they</span> <span word="be">be</span> <span word="doing">doing</span> <span word="there">there</span>?</p><p> 他们可能正在那里干什么？</p><p> <span word="He">He</span> <span word="can">can</span>'<span word="t">t</span> <span word="be">be</span> <span word="in">in</span> <span word="the">the</span> <span word="classroom">classroom</span>, <span word="for">for</span> <span word="the">the</span> <span word="light">light</span> <span word="has">has</span> <span word="been">been</span> <span word="turned">turned</span> <span word="off">off</span>. 他不可能在教室，因为灯已关了。</p><p> (5)<span word="can">can</span>'<span word="t">t</span>/<span word="never">never</span> ... <span word="too">too</span>/<span word="enough">enough</span>表示“再……也不为过”。</p><p> <span word="You">You</span> <span word="can">can</span> <span word="never">never</span> <span word="be">be</span> <span word="too">too</span> <span word="careful">careful</span> <span word="while">while</span> <span word="driving">driving</span> <span word="a">a</span> <span word="car">car</span>. 开车时再小心都不为过。</p>
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