从零开始学语法：不定冠词的用法
<p> 不定冠词的用法</p><p> 不定冠词有<span word="a">a</span> 和 <span word="an">an</span>两种形式。<span word="a">a</span>用在以辅音开头的词前，<span word="an">an</span>用在以元音开头的词前。</p><p> 注意：判断一个词是以元音开头还是以辅音开头，是根据读音而不是根据字母，这一点很多初学者会搞错哦。</p><p> 1. 用于可数名词的单数形式前，表示一</p><p> <span word="There">There</span> <span word="is">is</span> <span word="a">a</span> <span word="tiger">tiger</span> <span word="in">in</span> <span word="the">the</span> <span word="zoo">zoo</span>. 动物园里有一只老虎。</p><p> 2. 表示一类人或物</p><p> <span word="A">A</span> <span word="tiger">tiger</span> <span word="can">can</span> <span word="be">be</span> <span word="dangerous">dangerous</span>. 老虎可能有危害性。</p><p> 3. 表示某一个的意思</p><p> <span word="A">A</span> <span word="gentleman">gentleman</span> <span word="wants">wants</span> <span word="to">to</span> <span word="see">see</span> <span word="you">you</span>. 有位先生要见你。</p><p> 4. 表示同一的意思</p><p> <span word="They">They</span> <span word="are">are</span> <span word="nearly">nearly</span> <span word="of">of</span> <span word="an">an</span> <span word="age">age</span>. 他们几乎同岁。</p><p> <span word="The">The</span> <span word="two">two</span> <span word="shirts">shirts</span> <span word="are">are</span> <span word="much">much</span> <span word="of">of</span> <span word="a">a</span> <span word="size">size</span>. 这两件衬衫大小差不多。</p><p> 5. 表示每一的意思</p><p> <span word="We">We</span> <span word="go">go</span> <span word="swimming">swimming</span> <span word="four">four</span> <span word="times">times</span> <span word="a">a</span> <span word="week">week</span>. 我们每周去游泳四次。</p><p> 6. 用在作表语的单数可数名词前，表示身份、职业</p><p> <span word="My">My</span> <span word="mother">mother</span> <span word="is">is</span> <span word="a">a</span> <span word="teacher">teacher</span>. 我妈妈是老师。</p><p> 7. 第一次提到的人或事物，但不特别指明是哪一个</p><p> <span word="Long">Long</span> <span word="long">long</span> <span word="ago">ago</span> <span word="there">there</span> <span word="was">was</span> <span word="an">an</span> <span word="old">old</span> <span word="king">king</span> <span word="who">who</span> <span word="had">had</span> <span word="a">a</span> <span word="very">very</span> <span word="beautiful">beautiful</span> <span word="daughter">daughter</span>. 很久很久以前，有一个年老的国王，他有一个非常美丽的女儿。</p>
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