2016届高考英语一轮语法复习课件（广东专用）：情态动词(北师大版)
<p> 3.表示请求许可，可说<span word="May">May</span>/<span word="Might">Might</span>/<span word="Can">Can</span>/<span word="Could">Could</span> <span word="I">I</span>…？但表示给予许可时，不能用<span word="might">might</span>/<span word="could">could</span>，即不说<span word="you">you</span> <span word="might">might</span>/<span word="could">could</span>。</p><p> 4.<span word="must">must</span>强调主观认为“必须” 做某事，只有一般现在时态；而<span word="have">have</span> <span word="to">to</span> 强调客观上要求“不得不” 做某事，有更多的时态变化；<span word="mustn">mustn</span>’<span word="t">t</span>“不准”，而<span word="don">don</span>’<span word="t">t</span> <span word="have">have</span> <span word="to">to</span> =<span word="needn">needn</span>’<span word="t">t</span>“不必”。 5.表示“应该，应当”，<span word="should">should</span>和<span word="ought">ought</span> <span word="to">to</span>可互换，只是<span word="ought">ought</span> <span word="to">to</span>的语气稍重；<span word="should">should</span>强调主 观看法，而<span word="ought">ought</span> <span word="to">to</span>强调客观要求。 6.表示推测的情态动词，若按语气强弱排列，依次有<span word="must">must</span>， <span word="can">can</span>， <span word="could">could</span>， <span word="may">may</span>， <span word="might">might</span>等。其中，<span word="could">could</span>， <span word="might">might</span>不一定是<span word="can">can</span>， <span word="may">may</span>的过去式，只是语气分别比<span word="can">can</span>， <span word="may">may</span>更弱。使用时注意以下几点：</p><p> ⑴ <span word="must">must</span> 只用于肯定句，表示有把握的推测，可译作“一定会，准会”。 ⑵</p><p> <span word="can">can</span>一般不用于肯定句，可译作“可能”；但语气稍弱的<span word="could">could</span>可用于肯定句；<span word="can">can</span>表示“有时也会” 时也可用于肯定句。</p><p> ⑶</p><p> <span word="may">may</span>不用于疑问句，表示没有把握的推测，常译作“或许，可能”。</p><p> ⑷</p><p> 用于否定句：<span word="can">can</span>’<span word="t">t</span>， <span word="couldn">couldn</span>’<span word="t">t</span>不可能；<span word="may">may</span>/<span word="might">might</span> <span word="not">not</span>可能不。</p><p> 灵活运用</p><p> 1. <span word="I">I</span> _______<span word="worry">worry</span> <span word="about">about</span> <span word="my">my</span> <span word="weekend">weekend</span>—<span word="I">I</span> <span word="always">always</span> <span word="have">have</span> <span word="my">my</span> <span word="plans">plans</span> <span word="ready">ready</span> <span word="before">before</span> <span word="it">it</span> <span word="comes">comes</span>. 意为“不必”。句意为：我不必担心我的周末——我总是没等到周末就把计划安排好了。</p>
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