2015年的职称英语基础知识解析：不定式
<p> 相关背景知识介绍:</p><p> 非谓语动词结构可以简单地分为：不定式、动名词、分词-<span word="ing">ing</span>和分词-<span word="ed">ed</span>式。不同类型的非谓语动词在句中起着不同的语法功能，而且它们也存在着语态和时态的变化。非谓语动词结构在书面语中用的很多，如：<span word="A">A</span> <span word="Thirsty">Thirsty</span> <span word="World">World</span></p><p> <span word="In">In</span> <span word="addition">addition</span> <span word="to">to</span> <span word="stopping">stopping</span> <span word="wasting">wasting</span> <span word="precious">precious</span> <span word="water">water</span>, <span word="one">one</span> <span word="useful">useful</span> <span word="step">step</span> <span word="we">we</span> <span word="should">should</span> <span word="take">take</span> <span word="is">is</span> <span word="to">to</span> <span word="develop">develop</span> <span word="ways">ways</span> <span word="of">of</span> <span word="reusing">reusing</span> <span word="it">it</span>. <span word="Experiments">Experiments</span> <span word="have">have</span> <span word="already">already</span> <span word="been">been</span> <span word="done">done</span> <span word="in">in</span> <span word="this">this</span> <span word="field">field</span>, <span word="but">but</span> <span word="only">only</span> <span word="on">on</span> <span word="a">a</span> <span word="small">small</span> <span word="scale">scale</span>.</p><p> <span word="Today">Today</span>, <span word="in">in</span> <span word="most">most</span> <span word="large">large</span> <span word="cities">cities</span>, <span word="water">water</span> <span word="is">is</span> <span word="used">used</span> <span word="only">only</span> <span word="once">once</span> <span word="and">and</span> <span word="it">it</span> <span word="eventually">eventually</span> <span word="returns">returns</span> <span word="to">to</span> <span word="the">the</span> <span word="sea">sea</span> <span word="or">or</span> <span word="runs">runs</span> <span word="into">into</span> <span word="underground">underground</span> <span word="storage">storage</span> <span word="tanks">tanks</span>. <span word="But">But</span> <span word="it">it</span> <span word="is">is</span> <span word="possible">possible</span> <span word="to">to</span> <span word="pipe">pipe</span> <span word="water">water</span>用管子输送 <span word="that">that</span> <span word="has">has</span> <span word="been">been</span> <span word="used">used</span> <span word="to">to</span> <span word="a">a</span> <span word="purifying">purifying</span>使纯净 <span word="plant">plant</span> .</p><p> <span word="precious">precious</span> -- <span word="valuable">valuable</span> 珍贵的</p><p> 小节：</p><p> 1. 非谓语结构一定是由于前面结构的需要而出现;</p><p> 2. 不定式结构的构成是： <span word="to">to</span> + <span word="v">v</span>.;动名词结构的构成是： <span word="v">v</span>.<span word="ing">ing</span></p><p> 3. 介词和及物动词的后面需要出现名词或动名词结构; 系动词后面可以跟表示动作发生在将来的不定式结构。</p><p> 对于不定式结构具有名词的性质这个特点， 建议大家可以记住这个句子： <span word="To">To</span> <span word="err">err</span> <span word="is">is</span> <span word="human">human</span>. 人非圣人孰能无过。</p><p> </p>
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