must表示推测
<p> 1) <span word="must">must</span>用在肯定句中表示较有把握的推测，意为一定。</p><p> 2) <span word="must">must</span>表对现在的状态或现在正发生的事情的推测时， <span word="must">must</span> 后面通常接系动词<span word="be">be</span> 的原形或行为动词的进行式。 </p><p> <span word="You">You</span> <span word="have">have</span> <span word="worked">worked</span> <span word="hard">hard</span> <span word="all">all</span> <span word="day">day</span>.<span word="You">You</span> <span word="must">must</span> <span word="be">be</span> <span word="tired">tired</span>. 你辛苦干一整天，一定累了。（对现在情况的推测判断）</p><p> <span word="He">He</span> <span word="must">must</span> <span word="be">be</span> <span word="working">working</span> <span word="in">in</span> <span word="his">his</span> <span word="office">office</span>. 他一定在办公室工作呢。</p><p> 比较： <span word="http">http</span>://<span word="yingyu">yingyu</span>.<span word="chazidian">chazidian</span>.<span word="com">com</span></p><p> <span word="He">He</span> <span word="must">must</span> <span word="be">be</span> <span word="staying">staying</span> <span word="there">there</span>. </p><p> 他现在肯定呆在那里。</p><p> <span word="He">He</span> <span word="must">must</span> <span word="stay">stay</span> <span word="there">there</span>. </p><p> 他必须呆在那。 </p><p> 3) <span word="must">must</span> 表示对已发生的事情的推测时，<span word="must">must</span> 要接完成式。</p><p> <span word="I">I</span> <span word="didn">didn</span>’<span word="t">t</span> <span word="hear">hear</span> <span word="the">the</span> <span word="phone">phone</span>. <span word="I">I</span> <span word="must">must</span> <span word="have">have</span> <span word="been">been</span> <span word="asleep">asleep</span>. 我刚才没有听到电话，我想必是睡着了。</p><p> 4) <span word="must">must</span>表示对过去某时正发生的事情的推测，<span word="must">must</span> 后面要接不定式的完成进行式。</p><p> ---<span word="Why">Why</span> <span word="didn">didn</span>’<span word="t">t</span> <span word="you">you</span> <span word="answer">answer</span> <span word="my">my</span> <span word="phone">phone</span> <span word="call">call</span>?</p><p> ---<span word="Well">Well</span>, <span word="I">I</span> <span word="must">must</span> <span word="have">have</span> <span word="been">been</span> <span word="sleeping">sleeping</span>, <span word="so">so</span> <span word="I">I</span> <span word="didn">didn</span>’<span word="t">t</span> <span word="hear">hear</span> <span word="it">it</span>.</p><p> 5) 否定推测用<span word="can">can</span>’<span word="t">t</span>。</p><p> <span word="If">If</span> <span word="Tom">Tom</span> <span word="didn">didn</span>’<span word="t">t</span> <span word="leave">leave</span> <span word="here">here</span> <span word="until">until</span> <span word="five">five</span> <span word="o">o</span>’<span word="clock">clock</span>, <span word="he">he</span> <span word="can">can</span>’<span word="t">t</span> <span word="be">be</span> <span word="home">home</span> <span word="yet">yet</span>. 如果汤姆五点才离开这儿，他此时一定还未到家。</p></p>
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