从零开始学语法：不可数名词
<p> 不可数名词的语法特征</p><p> 1. 不可数名词不能接受不定冠词<span word="a">a</span>, <span word="an">an</span>的限制。如果不可数名词的前面出现不定冠词<span word="a">a</span>, <span word="an">an</span>，则说明这个不可数名词已经转化了。如：</p><p> <span word="There">There</span> <span word="is">is</span> <span word="snow">snow</span> <span word="on">on</span> <span word="the">the</span> <span word="ground">ground</span>. 地上有雪。</p><p> <span word="There">There</span> <span word="was">was</span> <span word="a">a</span> <span word="heavy">heavy</span> <span word="snow">snow</span> <span word="last">last</span> <span word="night">night</span>. 昨晚下了一场大雪。</p><p> <span word="I">I</span> <span word="dont">dont</span> <span word="like">like</span> <span word="coffee">coffee</span>. 我不喜欢咖啡。</p><p> <span word="A">A</span> <span word="coffee">coffee</span>, <span word="please">please</span>. 请来一份咖啡。</p><p> 2. 不可数名词没有复数形式。有的以-<span word="s">s</span>结尾的不可数名词并没有复数的概念。如：</p><p> <span word="Theres">Theres</span> <span word="good">good</span> <span word="news">news</span> <span word="tonight">tonight</span>. 今晚有好消息。</p><p> 3. 不可数名词受<span word="the">the</span>限制时，表示特指;不受任何冠词限制时，表示泛指。如：</p><p> <span word="We">We</span> <span word="cant">cant</span> <span word="live">live</span> <span word="without">without</span> <span word="air">air</span>. 没有空气我们就不能活。</p><p> <span word="Open">Open</span> <span word="the">the</span> <span word="window">window</span>. <span word="The">The</span> <span word="air">air</span> <span word="is">is</span> <span word="so">so</span> <span word="bad">bad</span>. 打开窗户吧。里面的空气很不好。</p><p> <span word="Its">Its</span> <span word="pleasant">pleasant</span> <span word="to">to</span> <span word="walk">walk</span> <span word="in">in</span> <span word="soft">soft</span> <span word="snow">snow</span>. 在松软的雪里走很舒服。</p><p> <span word="Lets">Lets</span> <span word="take">take</span> <span word="a">a</span> <span word="walk">walk</span> <span word="in">in</span> <span word="the">the</span> <span word="snow">snow</span>. 咱们去踏雪散散步。</p><p> 4. 不可数名词作主语时，谓语动词用单数形式。如：</p><p> <span word="Physics">Physics</span> <span word="is">is</span> <span word="a">a</span> <span word="difficult">difficult</span> <span word="subject">subject</span> <span word="for">for</span> <span word="me">me</span>. 对我来说物理是一门难学的科目。</p><p> 5. 不可数名词不能受基数词的修饰，如果确实要表达数量关系，必需加上表示个体性的单位词。如：</p>
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