初二英语上册语法复习详解（17）-不定冠词a与an的使用
<p> 17) 不定冠词<span word="a">a</span>与<span word="an">an</span>的使用</p><p> 1.<span word="a">a</span> 用在以辅音音素开头的单词前。如：</p><p> <span word="There">There</span> <span word="is">is</span> <span word="a">a</span> <span word="b">b</span> <span word="in">in</span> <span word="the">the</span> <span word="word">word</span> <span word="book">book</span>. 单词<span word="book">book</span>中有个字母<span word="b">b</span>。</p><p> 类似的字母还有：<span word="c">c</span>, <span word="d">d</span>, <span word="g">g</span>, <span word="j">j</span>, <span word="k">k</span>, <span word="p">p</span>, <span word="q">q</span>, <span word="t">t</span>, <span word="u">u</span>, <span word="v">v</span>, <span word="w">w</span>, <span word="y">y</span>, <span word="z">z</span>。</p><p> <span word="She">She</span> <span word="has">has</span> <span word="a">a</span> <span word="small">small</span> <span word="knife">knife</span>. 她有一把小刀。</p><p> 2.<span word="an">an</span> 用于以元音音素开头的单词前。如：</p><p> <span word="There">There</span> <span word="is">is</span> <span word="an">an</span> <span word="i">i</span> <span word="in">in</span> <span word="the">the</span> <span word="word">word</span> <span word="onion">onion</span>. 单词<span word="onion">onion</span>中有个字母<span word="i">i</span>。</p><p> 类似的字母还有：<span word="a">a</span>, <span word="e">e</span>, <span word="f">f</span>, <span word="h">h</span>, <span word="l">l</span>, <span word="m">m</span>, <span word="n">n</span>, <span word="o">o</span>, <span word="r">r</span>, <span word="s">s</span>, <span word="x">x</span>。</p><p> <span word="Do">Do</span> <span word="you">you</span> <span word="have">have</span> <span word="an">an</span> <span word="umbrella">umbrella</span>? 你有一把雨伞吗？</p><p> 3.以元音字母开头的单词前面不一定都用<span word="an">an</span>；以辅音字母开头的单词前面也不一定都用<span word="a">a</span>.如：</p><p> <span word="a">a</span> <span word="useful">useful</span> <span word="book">book</span></p><p> <span word="a">a</span> <span word="universe">universe</span></p><p> <span word="a">a</span> <span word="one">one</span>-<span word="letter">letter</span> <span word="word">word</span></p><p> <span word="an">an</span> <span word="hour">hour</span></p><p> <span word="an">an</span> <span word="uncle">uncle</span></p><p> <span word="an">an</span> <span word="umbrella">umbrella</span></p><p> <span word="an">an</span> <span word="honest">honest</span> <span word="person">person</span></p>
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