从零开始学语法：情态动词如何表猜测
<p> 情态动词用于肯定猜测</p><p> 1. <span word="must">must</span>用于肯定句，表示较有把握的推测，意为准是，一定。后面接动词原形，表示对现在的推测。如：</p><p> -<span word="Ive">Ive</span> <span word="had">had</span> <span word="no">no</span> <span word="sleep">sleep</span> <span word="for">for</span> 48 <span word="hours">hours</span>. 我已经48小时没睡觉了。</p><p> -<span word="You">You</span> <span word="must">must</span> <span word="be">be</span> <span word="very">very</span> <span word="tired">tired</span>. 你一定很累了。</p><p> 2. <span word="should">should</span>用于肯定句中，语气次之，意为很可能，应该，指按常理推测。如：</p><p> <span word="They">They</span> <span word="left">left</span> <span word="yesterday">yesterday</span>. <span word="They">They</span> <span word="should">should</span> <span word="be">be</span> <span word="home">home</span> <span word="by">by</span> <span word="now">now</span>. 他们昨天就离开了，现在该到家了。</p><p> 3. <span word="can">can</span>用在肯定句中，表示理论上的可能性。如：</p><p> <span word="Smoking">Smoking</span> <span word="can">can</span> <span word="cause">cause</span> <span word="cancer">cancer</span>. 吸烟有可能引起癌症。</p><p> 4. <span word="may">may</span>用在肯定句中，表示对现在把握不大的推测，意为也许，可能。如：</p><p> <span word="Dont">Dont</span> <span word="play">play</span> <span word="with">with</span> <span word="the">the</span> <span word="knife">knife</span>. <span word="You">You</span> <span word="may">may</span> <span word="cut">cut</span> <span word="yourself">yourself</span>. 不要玩小刀，你可能会伤了自己。</p><p> 5. <span word="could">could</span>, <span word="might">might</span>也可表示推测意义，常用在过去时态中;但在某些场合下，为了使语气更缓和、更委婉，常用<span word="could">could</span>, <span word="might">might</span>代替<span word="can">can</span>, <span word="may">may</span>。如：</p><p> <span word="They">They</span> <span word="saw">saw</span> <span word="something">something</span> <span word="in">in</span> <span word="the">the</span> <span word="sky">sky</span> <span word="last">last</span> <span word="night">night</span>. <span word="It">It</span> <span word="could">could</span>/<span word="might">might</span> <span word="be">be</span> <span word="a">a</span> <span word="UFO">UFO</span>. 昨天晚上他们看见天空中有个东西。它有可能是不明飞行物。</p><p> <span word="You">You</span> <span word="may">may</span>/<span word="might">might</span>/<span word="could">could</span> <span word="be">be</span> <span word="very">very</span> <span word="tired">tired</span>. 你可能很累吧!</p><p> 情态动词用于否定猜测</p>
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