基础英语讲座【54】
<p> 【<span word="Can">Can</span> <span word="you">you</span> <span word="come">come</span> <span word="and">and</span> <span word="play">play</span> <span word="football">football</span>?】</p><p> <span word="Can">Can</span> <span word="you">you</span> <span word="come">come</span> <span word="and">and</span> <span word="play">play</span> <span word="football">football</span>?你能来参加踢足球吗？</p><p> <span word="can">can</span> 是情态动词，表示能，情态动词有<span word="shall">shall</span>（将），<span word="will">will</span>（将），<span word="can">can</span>（能），<span word="could">could</span>（能），<span word="may">may</span>（可以），<span word="must">must</span>（必须），<span word="have">have</span> <span word="to">to</span>（不得不）等。情态动词只能和动词原形一起使用，构成谓语部分。情态动词加<span word="not">not</span> 构成句子的否定式，情态动词提到主语前，构成疑问句（有关详细内容请参考本软件的语法部分）。例如：</p><p> 【<span word="You">You</span> <span word="can">can</span> <span word="take">take</span> <span word="the">the</span> <span word="books">books</span> <span word="out">out</span> <span word="of">of</span> <span word="the">the</span> <span word="classroom">classroom</span>.】</p><p> 你们可以把书带出教室。</p><p> <span word="May">May</span> <span word="I">I</span> <span word="come">come</span> <span word="in">in</span>?<span word="Yes">Yes</span>,<span word="please">please</span>.</p><p> 我可以进来吗？可以，请吧。</p><p> <span word="You">You</span> <span word="mustnt">mustnt</span> <span word="play">play</span> <span word="football">football</span> <span word="in">in</span> <span word="the">the</span> <span word="street">street</span>.</p><p> 你不能在街道上踢足球。</p><p> <span word="Im">Im</span> <span word="sorry">sorry</span>.<span word="I">I</span> <span word="have">have</span> <span word="to">to</span> <span word="go">go</span> <span word="now">now</span>.</p><p> 对不起，我得走了。</p><p> 【<span word="I">I</span> <span word="have">have</span> <span word="to">to</span> <span word="tidy">tidy</span> <span word="my">my</span> <span word="room">room</span>.】</p><p> <span word="I">I</span> <span word="have">have</span> <span word="to">to</span> <span word="tidy">tidy</span> <span word="my">my</span> <span word="room">room</span>.我得打扫房间。</p><p> <span word="Have">Have</span> <span word="to">to</span> 是情态动词，表示不得不必须强调客观条件的需要，而情态动词<span word="must">must</span> 也表示必须但则重于主观认为的必要性。例如：</p><p> <span word="I">I</span> <span word="feel">feel</span> <span word="ill">ill</span>,<span word="I">I</span> <span word="have">have</span> <span word="to">to</span> <span word="see">see</span> <span word="a">a</span> <span word="doctor">doctor</span>.</p><p> 我病了，我得去看大夫。</p><p> <span word="You">You</span> <span word="must">must</span> <span word="study">study</span> <span word="hard">hard</span> <span word="if">if</span> <span word="you">you</span> <span word="want">want</span> <span word="to">to</span> <span word="study">study</span> <span word="well">well</span>.</p>
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