从零开始学语法：need是实义动词or情态动词？
<p> <span word="need">need</span> 作实义动词</p><p> <span word="On">On</span> <span word="the">the</span> <span word="one">one</span> <span word="hand">hand</span>, <span word="it">it</span> <span word="can">can</span> <span word="be">be</span> <span word="used">used</span> <span word="as">as</span> <span word="an">an</span> <span word="ordinary">ordinary</span> <span word="verb">verb</span> <span word="and">and</span> <span word="has">has</span> <span word="the">the</span> <span word="same">same</span> <span word="forms">forms</span> <span word="as">as</span> <span word="an">an</span> <span word="ordinary">ordinary</span> <span word="verb">verb</span>. <span word="The">The</span> <span word="third">third</span> <span word="person">person</span> <span word="singular">singular</span> <span word="ends">ends</span> <span word="with">with</span> <span word="an">an</span> <span word="s">s</span>, <span word="and">and</span> <span word="questions">questions</span> <span word="and">and</span> <span word="negatives">negatives</span> <span word="are">are</span> <span word="formed">formed</span> <span word="with">with</span> <span word="do">do</span>. <span word="As">As</span> <span word="an">an</span> <span word="ordinary">ordinary</span> <span word="verb">verb</span>, <span word="need">need</span> <span word="is">is</span> <span word="normally">normally</span> <span word="followed">followed</span> <span word="by">by</span> <span word="an">an</span> <span word="infinitive">infinitive</span> <span word="with">with</span> <span word="to">to</span>:</p><p> 一方面，<span word="need">need</span>可用作实义动词，此时它的用法跟其他动词一样：第三人称单数作主语时加<span word="s">s</span>，疑问句和否定句用<span word="do">do</span>来构成。做实义动词时，<span word="need">need</span>一般接带<span word="to">to</span>的不定式。例句：</p><p> <span word="A">A</span>: <span word="He">He</span> <span word="needs">needs</span> <span word="to">to</span> <span word="see">see</span> <span word="a">a</span> <span word="doctor">doctor</span>. <span word="Do">Do</span> <span word="you">you</span> <span word="need">need</span> <span word="to">to</span> <span word="see">see</span> <span word="one">one</span> <span word="too">too</span>?</p><p> <span word="A">A</span>: 他要去看医生。你要去吗?</p><p> <span word="B">B</span>: <span word="No">No</span>, <span word="I">I</span> <span word="dont">dont</span> <span word="need">need</span> <span word="to">to</span> <span word="see">see</span> <span word="a">a</span> <span word="doctor">doctor</span>. <span word="But">But</span> <span word="I">I</span> <span word="need">need</span> <span word="a">a</span> <span word="good">good</span> <span word="rest">rest</span>.</p><p> <span word="B">B</span>: 不，我不需要看医生。但我要好好休息一下。</p><p> <span word="In">In</span> <span word="this">this</span> <span word="sense">sense</span>, <span word="when">when</span> <span word="we">we</span> <span word="are">are</span> <span word="talking">talking</span> <span word="about">about</span> <span word="necessity">necessity</span>, <span word="we">we</span> <span word="generally">generally</span> <span word="prefer">prefer</span> <span word="need">need</span> <span word="to">to</span> / <span word="do">do</span> <span word="not">not</span> <span word="need">need</span> <span word="to">to</span>.</p><p> 从这个角度讲，当我们谈论必须时，我们一般倾向于使用<span word="need">need</span> <span word="to">to</span> / <span word="do">do</span> <span word="not">not</span> <span word="need">need</span> <span word="to">to</span>(也就是将<span word="need">need</span>作为实义动词用)。</p><p> <span word="need">need</span> 作情态动词</p><p> <span word="In">In</span> <span word="the">the</span> <span word="other">other</span> <span word="format">format</span>, <span word="need">need</span> <span word="behaves">behaves</span> <span word="as">as</span> <span word="a">a</span> <span word="modal">modal</span> <span word="verb">verb</span>, <span word="like">like</span> <span word="can">can</span>, <span word="could">could</span>, <span word="must">must</span>, <span word="should">should</span>, <span word="etc">etc</span>. <span word="It">It</span> <span word="has">has</span> <span word="the">the</span> <span word="same">same</span> <span word="forms">forms</span> <span word="as">as</span> <span word="modal">modal</span> <span word="auxiliary">auxiliary</span> <span word="verbs">verbs</span>: <span word="the">the</span> <span word="third">third</span> <span word="person">person</span> <span word="singular">singular</span> <span word="has">has</span> <span word="no">no</span> <span word="s">s</span>, <span word="questions">questions</span> <span word="and">and</span> <span word="negatives">negatives</span> <span word="are">are</span> <span word="made">made</span> <span word="without">without</span> <span word="do">do</span>. <span word="In">In</span> <span word="this">this</span> <span word="format">format</span>, <span word="need">need</span> <span word="is">is</span> <span word="followed">followed</span> <span word="by">by</span> <span word="an">an</span> <span word="infinitive">infinitive</span> <span word="without">without</span> <span word="to">to</span>:</p>
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