［冠词和数词］不定冠词的用法
<p> 冠词本身不能单独使用，也没有词义，它用在名词的前面，帮助指明名词的含义。英语中的冠词有三种，一种是定冠词，另一种是不定冠词，还有一种是零冠词。</p><p> 不定冠词<span word="a">a</span> （<span word="an">an</span>）与数词<span word="one">one</span> 同源，是一个的意思。<span word="a">a</span>用于辅音音素前，一般读作[<span word="e">e</span>]，而<span word="an">an</span>则用于元音音素前，一般读做[<span word="en">en</span>].</p><p> 1） 表示一个，意为<span word="one">one</span>；指某人或某物，意为<span word="a">a</span> <span word="certain">certain</span>.例如：</p><p> <span word="A">A</span> <span word="Mr">Mr</span>. <span word="Ling">Ling</span> <span word="is">is</span> <span word="waiting">waiting</span> <span word="for">for</span> <span word="you">you</span>. 有位姓凌的先生在等你。</p><p> 2） 代表一类人或物。例如：</p><p> <span word="A">A</span> <span word="knife">knife</span> <span word="is">is</span> <span word="a">a</span> <span word="tool">tool</span> <span word="for">for</span> <span word="cutting">cutting</span> <span word="with">with</span>. 刀是切割的工具。</p><p> <span word="Mr">Mr</span>. <span word="Smith">Smith</span> <span word="is">is</span> <span word="an">an</span> <span word="engineer">engineer</span>. 史密斯先生是工程师。</p><p> 3） 组成词组或成语，如<span word="a">a</span> <span word="little">little</span> / <span word="a">a</span> <span word="few">few</span> / <span word="a">a</span> <span word="lot">lot</span> / <span word="a">a</span> <span word="type">type</span> <span word="of">of</span> / <span word="a">a</span> <span word="pile">pile</span> / <span word="a">a</span> <span word="great">great</span> <span word="many">many</span> / <span word="many">many</span> <span word="a">a</span> / <span word="as">as</span> <span word="a">a</span> <span word="rule">rule</span> / <span word="in">in</span> <span word="a">a</span> <span word="hurry">hurry</span> / <span word="in">in</span> <span word="a">a</span> <span word="minute">minute</span> / <span word="in">in</span> <span word="a">a</span> <span word="word">word</span> / <span word="in">in</span> <span word="a">a</span> <span word="short">short</span> <span word="while">while</span> / <span word="after">after</span> <span word="a">a</span> <span word="while">while</span> / <span word="have">have</span> <span word="a">a</span> <span word="cold">cold</span> / <span word="have">have</span> <span word="a">a</span> <span word="try">try</span> /<span word="keep">keep</span> <span word="an">an</span> <span word="eye">eye</span> <span word="on">on</span> / <span word="all">all</span> <span word="of">of</span> <span word="a">a</span> <span word="sudden">sudden</span>等。</p><p> </p>
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