从零开始学语法：情态动词must与have to的用法
<p> <span word="must">must</span> 的用法</p><p> 一、表义务，必须。例如：</p><p> <span word="You">You</span> <span word="must">must</span> <span word="talk">talk</span> <span word="to">to</span> <span word="them">them</span> <span word="about">about</span> <span word="their">their</span> <span word="study">study</span>. 你必须同他们谈谈关于他们学习的事。</p><p> 二、在否定结构中表不许。例如：</p><p> <span word="You">You</span> <span word="mustnt">mustnt</span> <span word="leave">leave</span> <span word="here">here</span>. 你不能离开这儿。</p><p> 三、表推测，暗含有很大的可能性。例如：</p><p> <span word="He">He</span> <span word="must">must</span> <span word="be">be</span> <span word="ill">ill</span>. <span word="He">He</span> <span word="looks">looks</span> <span word="so">so</span> <span word="pale">pale</span>. 他肯定是病了。他的脸色那么苍白。</p><p> 注意：之前我们说过 <span word="may">may</span> 也可以表猜测，但是 <span word="may">may</span> 暗含的可能性较小，<span word="must">must</span> 暗含的可能性较大。另外否定的猜测是用<span word="cant">cant</span>。例如：</p><p> <span word="The">The</span> <span word="baby">baby</span> <span word="cant">cant</span> <span word="be">be</span> <span word="ill">ill</span>. <span word="He">He</span> <span word="is">is</span> <span word="so">so</span> <span word="active">active</span>. 那宝宝不大可能是病了。他那么活跃。</p><p> 四、表不可避免，必然要，必定会。例如：</p><p> <span word="All">All</span> <span word="men">men</span> <span word="must">must</span> <span word="die">die</span>. 人总有一死。</p><p> 五、表主张，坚持要，一定要。例如：</p><p> <span word="If">If</span> <span word="you">you</span> <span word="must">must</span> <span word="go">go</span>, <span word="at">at</span> <span word="least">least</span> <span word="wait">wait</span> <span word="till">till</span> <span word="the">the</span> <span word="rain">rain</span> <span word="stops">stops</span>. 如果你坚持要走，至少也要等雨停了再走。</p><p> 六、关于 <span word="must">must</span> 的简短回答：</p><p> -<span word="Must">Must</span> <span word="I">I</span> <span word="clean">clean</span> <span word="the">the</span> <span word="dining">dining</span> <span word="room">room</span> <span word="at">at</span> <span word="once">once</span>? 我必须马上打扫膳厅吗?</p><p> -<span word="Yes">Yes</span>, <span word="you">you</span> <span word="must">must</span>. 是的。</p><p> -<span word="No">No</span>, <span word="you">you</span> <span word="neednt">neednt</span>. / <span word="No">No</span>, <span word="you">you</span> <span word="dont">dont</span> <span word="have">have</span> <span word="to">to</span>. 不必马上打扫。</p>
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