2017届高考英语考前冲刺：强化情态动词和虚拟语气
<p> 2017届高考英语考前冲刺专题强化情态动词和虚拟语气</p><p> 一、几组常见情态动词的含义及用法</p><p> 1．<span word="can">can</span>和<span word="could">could</span>的用法</p><p> <span word="can">can</span>可以表示能力；表示客观的可能性；表示请示和允许；表示惊异、怀疑、不相信的态度，主要用于肯定句、否定句和疑问句。表示对现在或将来的推测时，两者均可用，但<span word="can">can</span>通常只用于否定句或疑问句中，一般不用于肯定句，而<span word="could">could</span>则可用于肯定句、否定句和疑问句。<span word="could">could</span>可表示请求，语气较之<span word="can">can</span>更委婉，多用于疑问句，其答语应用<span word="can">can</span>。</p><p> [典例1] (2011年高考江西卷)<span word="It">It</span>________<span word="be">be</span> <span word="the">the</span> <span word="postman">postman</span> <span word="at">at</span> <span word="the">the</span> <span word="door">door</span>.<span word="It">It</span>'<span word="s">s</span> <span word="only">only</span> <span word="six">six</span> <span word="o">o</span>'<span word="clock">clock</span>.</p><p> <span word="A">A</span>．<span word="mustn">mustn</span>'<span word="tB">tB</span>．<span word="can">can</span>'<span word="t">t</span></p><p> <span word="C">C</span>．<span word="won">won</span>'<span word="t">t</span></p><p> <span word="D">D</span>．<span word="needn">needn</span>'<span word="t">t</span></p><p> [解析] 句意：门口的人不可能是邮递员，现在才六点。<span word="mustn">mustn</span>'<span word="t">t</span>禁止，不许；<span word="can">can</span>'<span word="t">t</span>不可能；<span word="won">won</span>'<span word="t">t</span>将不会；<span word="needn">needn</span>'<span word="t">t</span>不需要。根据“现在才六点”可知说话者作出“不可能”的推断。</p><p> [答案] <span word="B">B</span></p><p> 点金</p><p> <span word="can">can</span>的用法集锦</p><p> 1．<span word="cannot">cannot</span>....<span word="to">to</span>...“越……越好，无论怎样……也不过分”与<span word="can">can</span> <span word="never">never</span>...<span word="too">too</span>同义。</p><p> 2．<span word="cannot">cannot</span>/<span word="could">could</span> <span word="not">not</span> <span word="but">but</span>＋动词原形表示“只有，除……之外别无可能”，<span word="cannot">cannot</span> <span word="help">help</span> <span word="but">but</span>＋动词原形及<span word="cannot">cannot</span> <span word="help">help</span>＋动名词表示“不可避免某事”。</p>
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