中考英语复习：多层含义的情态动词
<p> 情态动词是动词大家族中的重要一员，虽然数量很少，但在表示情态意义上，有着不可替代的作用。情态动词在表示行为主体或说话者的感情和态度时，无人称和数的变化(<span word="have">have</span> <span word="to">to</span>除外)。它本身具有一定含义，但其意义并不完整，必须与其他动词一起构成谓语，才能表达相对完整的意思。从本质上说，情态动词也相当于一种助动词，它可以构成否定句，疑问句等。</p><p> 初中阶段学习的情态动词主要有<span word="can">can</span>／<span word="could">could</span>，<span word="may">may</span>／<span word="might">might</span>，<span word="must">must</span>，<span word="have">have</span> <span word="to">to</span>，<span word="shall">shall</span>／<span word="should">should</span>，<span word="will">will</span>／<span word="would">would</span>，<span word="need">need</span>，<span word="dare">dare</span>，<span word="be">be</span> <span word="able">able</span> <span word="to">to</span>等。情态动词在句子中有多层次意义。</p><p> 1.<span word="Can">Can</span></p><p> (1)能够，会(表体力和智力方面具有的能力，可与<span word="be">be</span> <span word="able">able</span> <span word="to">to</span>互换)，如：</p><p> <span word="Can">Can</span> <span word="you">you</span> <span word="draw">draw</span> <span word="horses">horses</span>?(智力方面)你会画马吗?</p><p> <span word="We">We</span> <span word="can">can</span> <span word="go">go</span> <span word="skating">skating</span>．(体力方面)我们会滑冰。</p><p> (2)可能(表客观的可能性或推测，用于否定句和疑问句)，如：</p><p> <span word="You">You</span> <span word="can">can</span>'<span word="t">t</span> <span word="be">be</span> <span word="wrong">wrong</span>．(可能性)你一定没错。</p><p> (3)表示非正式的请求或许可，此时可与<span word="may">may</span>互换，但<span word="may">may</span>更为正式。如：</p><p> <span word="Can">Can</span>／<span word="May">May</span> <span word="l">l</span> <span word="borrow">borrow</span> <span word="your">your</span> <span word="book">book</span>?我可以借一下你的书吗?</p><p> (4)<span word="could">could</span>是<span word="can">can</span>的过去式，但当<span word="could">could</span>出现在句首引导问句时，通常不做过去式，而表达委婉的请求或建议。如：</p>
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