比较need和dare
<p> 这两词既可做实义动词用，又可做情态动词用。作为情态动词，两者都只能用于疑问句，否定句和条件句。 <span word="need">need</span> 作实义动词时后面的不定式必须带<span word="to">to</span>，而<span word="dare">dare</span>作实义动词用时, 后面的<span word="to">to</span> 时常可以被省略。</p><p> 1) 实义动词： <span word="need">need</span> （需要, 要求）</p><p> <span word="need">need</span> + <span word="n">n</span>. / <span word="to">to</span> <span word="do">do</span> <span word="sth">sth</span></p><p> 2) 情态动词： <span word="need">need</span>，只用原形<span word="need">need</span>后加<span word="do">do</span>，否定形式为<span word="need">need</span> <span word="not">not</span>。</p><p> <span word="Need">Need</span> <span word="you">you</span> <span word="go">go</span> <span word="yet">yet</span>? </p><p> <span word="Yes">Yes</span>, <span word="I">I</span> <span word="must">must</span>. / <span word="No">No</span>, <span word="I">I</span> <span word="needn">needn</span>’<span word="t">t</span>.</p><p> 3) <span word="need">need</span> 的被动含义：<span word="need">need</span>, <span word="want">want</span>, <span word="require">require</span>, <span word="worth">worth</span>（形容词）后面接<span word="doing">doing</span>也可以表示被动： </p><p> <span word="need">need</span> <span word="doing">doing</span> = <span word="need">need</span> <span word="to">to</span> <span word="be">be</span> <span word="done">done</span></p>
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