【高二英语】语法：情态动词讲解
<p> 小编导语：高中英语语法分类讲解及练习资料(情态动词)是小编为你准备的高中英语语法分类讲解及练习资料(情态动词)。高中英语中有很多重要的语法点需要我们认真识记。以下就是小编为你准备的高中英语语法分类讲解及练习资料(情态动词)，供你学习参考。</p><p> 情态动词顾名思义就是表示情感和态度的词，常见的有：<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="dared">dared</span>); <span word="ought">ought</span> <span word="to">to</span>; 情态动词没有人称和数的变化，不能单独使用，它与其后的动词原形合成谓语结构。它们的用法如下：</p><p> 一. <span word="can">can</span>和<span word="could">could</span> 的用法</p><p> 1. 表示能力或客观的可能性，还可以表示请求和允许。如：</p><p> <span word="Can">Can</span> <span word="you">you</span> <span word="finish">finish</span> <span word="this">this</span> <span word="work">work</span> <span word="tonight">tonight</span>? <span word="Man">Man</span> <span word="cannot">cannot</span> <span word="live">live</span> <span word="without">without</span> <span word="air">air</span>.</p><p> <span word="Can">Can</span> <span word="I">I</span> <span word="go">go</span> <span word="now">now</span>?<span word="Yes">Yes</span>, <span word="you">you</span> <span word="can">can</span>.</p><p> 注意：</p><p> 1) <span word="could">could</span>表示语气较委婉的请求，主要用语疑问句，(用于此意义时不用在肯定句)答语用<span word="can">can</span>。</p><p> <span word="Could">Could</span> <span word="I">I</span> <span word="come">come</span> <span word="to">to</span> <span word="see">see</span> <span word="you">you</span> <span word="tomorrow">tomorrow</span>?</p><p> <span word="Yes">Yes</span>, <span word="you">you</span> <span word="can">can</span>. (不能用<span word="could">could</span>). (否定句常用<span word="No">No</span>, <span word="Im">Im</span> <span word="afraid">afraid</span> <span word="not">not</span>.)</p><p> 2) <span word="can">can</span>表示能力时，还可以用 <span word="be">be</span> <span word="able">able</span> <span word="to">to</span> 代替，例如：</p><p> <span word="Ill">Ill</span> <span word="be">be</span> <span word="able">able</span> <span word="to">to</span> <span word="come">come</span> <span word="this">this</span> <span word="afternoon">afternoon</span>.</p><p> 但当我们要表示某件事已成时，须用 <span word="was">was</span> (<span word="were">were</span>) <span word="able">able</span> <span word="to">to</span>不能用<span word="could">could</span>，例如：</p>
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