2017届高考英语一轮语法专题复习学案：第1部分 专题3 情态动词和虚拟语气（新人教版）
<p> ◆情态动词的核心考点</p><p> 1．<span word="can">can</span>，<span word="be">be</span> <span word="able">able</span> <span word="to">to</span> 和<span word="could">could</span></p><p> (1)<span word="can">can</span>和<span word="be">be</span> <span word="able">able</span> <span word="to">to</span>都表示能力，意思上没多大区别。但<span word="can">can</span>只有现在和过去时，而<span word="be">be</span> <span word="able">able</span> <span word="to">to</span>则有更多的形式。但当成功地完成某一具体动作时，通常不用<span word="could">could</span>而用<span word="was">was</span>/<span word="were">were</span> <span word="able">able</span> <span word="to">to</span>来表示。这时<span word="was">was</span>/<span word="were">were</span> <span word="able">able</span> <span word="to">to</span> 相当于<span word="managed">managed</span> <span word="to">to</span>，表示经过一番努力，终于能够完成某事。</p><p> <span word="Her">Her</span> <span word="mother">mother</span> <span word="can">can</span> <span word="speak">speak</span> <span word="French">French</span>.</p><p> <span word="The">The</span> <span word="wounded">wounded</span> <span word="man">man</span> <span word="was">was</span> <span word="still">still</span> <span word="able">able</span> <span word="to">to</span> <span word="get">get</span> <span word="to">to</span> <span word="the">the</span> <span word="village">village</span> <span word="and">and</span> <span word="was">was</span> <span word="saved">saved</span> <span word="by">by</span> <span word="the">the</span> <span word="villagers">villagers</span> <span word="in">in</span> <span word="the">the</span> <span word="end">end</span>.</p><p> (2)表示猜测“可能”，一般用于疑问句和否定句。</p><p> —<span word="Can">Can</span> <span word="the">the</span> <span word="news">news</span> <span word="be">be</span> <span word="true">true</span>?</p><p> —<span word="It">It</span> <span word="can">can</span>’<span word="t">t</span> <span word="be">be</span> <span word="true">true</span>.</p><p> <span word="Someone">Someone</span> <span word="is">is</span> <span word="knocking">knocking</span> <span word="at">at</span> <span word="the">the</span> <span word="door">door</span>.<span word="Who">Who</span> <span word="could">could</span> <span word="it">it</span> <span word="be">be</span>?</p><p> (3)<span word="can">can</span>可以表示理论上的可能性，指常有的行为或情形，意为“有时会……”。</p><p> <span word="Anybody">Anybody</span> <span word="can">can</span> <span word="make">make</span> <span word="mistakes">mistakes</span>.</p><p> (4)表示请求、允许(表请求时，口语中常用<span word="could">could</span>代替<span word="can">can</span>使语气更委婉，回答时用<span word="can">can</span>)。</p><p> <span word="Can">Can</span> <span word="I">I</span> <span word="go">go</span> <span word="now">now</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>.(否定答语可用<span word="No">No</span>，<span word="I">I</span>’<span word="m">m</span> <span word="afraid">afraid</span> <span word="not">not</span>.)</p><p> (5)表示惊异、怀疑、不相信的态度(主要用于否定句、疑问句或感叹句中)。</p><p> <span word="How">How</span> <span word="can">can</span> <span word="that">that</span> <span word="be">be</span> <span word="true">true</span>？<span word="I">I</span> <span word="can">can</span>’<span word="t">t</span> <span word="believe">believe</span> <span word="my">my</span> <span word="eyes">eyes</span> <span word="and">and</span> <span word="ears">ears</span>.</p>
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