中考英语复习指导：动词不定式用法汇总
<p> 中考英语复习指导：动词不定式用法汇总</p><p> 动词不定式(<span word="todo">todo</span>)是初中英语课的一个重点，也是中考要考查的一个项目。动词不定式属于非谓语动词的一种形式，很多同学经常把它和谓语动词混在一起，掌握起来有困难。下面我们对动词不定式的用法做简单归纳，帮助同学们记忆：</p><p> 一、动词不定式在句子中不能充当谓语，没有人称和数的变化。</p><p> 二、动词不定式是由<span word="to">to</span>+动词原形构成(有时可以不带<span word="to">to</span>)。动词不定式的否定形式是<span word="not">not</span>+动词不定式(<span word="not">not</span>不与助动词连用)。</p><p> 三、动词不定式短语具有名词、形容词和副词等的功能，可在句中用做多种句子成分。</p><p> 1、主语：常置于句末，而用<span word="it">it</span>代替其做形式主语。</p><p> 例：<span word="Togoinforsportshelpsyou">Togoinforsportshelpsyou</span></p><p> <span word="stayfit">stayfit</span>.(<span word="book">book</span>4，<span word="L">L</span>28)<span word="Ithelpsyoustayfittogoinforsports">Ithelpsyoustayfittogoinforsports</span>.<span word="Itisdangeroustoswiminthedeepseaonyourown">Itisdangeroustoswiminthedeepseaonyourown</span>.</p><p> 注：此句式中不定式逻辑上的主语可由<span word="for">for</span>或<span word="of">of</span>引出，逻辑主语由<span word="of">of</span>引出时，表语的形容词为<span word="kind">kind</span>，<span word="nice">nice</span>，<span word="good">good</span>，<span word="polite">polite</span>，<span word="clever">clever</span>，<span word="foolish">foolish</span>，<span word="right">right</span>，<span word="wrong">wrong</span>等表示</p><p> 评价的形容词。例：<span word="Itsrightofhimtorefusethe">Itsrightofhimtorefusethe</span></p><p> <span word="invitation">invitation</span>.(<span word="him">him</span>为逻辑主语)</p><p> 2、表语：<span word="Ourdutyistoprotecttheenviroment">Ourdutyistoprotecttheenviroment</span>.</p>
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