英语语法陈述句知识点：肯定句变否定句的基本方法
<p> 【导语】英语语法让很多学生都头疼，因为复杂难懂的句式和词组有时难以记忆。英语网为大家整理了小学英语语法大全，本章主要介绍英语语法中的句子成分，希望对同学们的英语语法学习有所帮助。更多内容尽在英语网。</p><p> 1. <span word="be">be</span>动词的否定式</p><p> <span word="be">be</span> 动词根据不同的人称和时态有不同的形式，在一般现在时中是<span word="am">am</span> , <span word="is">is</span> , <span word="are">are</span>可用作联系动词，构成否定式时，一律在其后面加否定词<span word="not">not</span>.</p><p> <span word="He">He</span> <span word="is">is</span> <span word="reading">reading</span>. --- <span word="He">He</span> <span word="is">is</span> <span word="not">not</span> <span word="reading">reading</span>. <span word="They">They</span> <span word="are">are</span> <span word="from">from</span> <span word="China">China</span>. --- <span word="They">They</span> <span word="are">are</span> <span word="not">not</span> <span word="from">from</span> <span word="China">China</span>.</p><p> 2. 情态动词的否定式</p><p> 情态动词的否定式是在其后面直接加<span word="not">not</span>. 如：</p><p> <span word="I">I</span> <span word="can">can</span> <span word="swim">swim</span>. --- <span word="I">I</span> <span word="cant">cant</span> <span word="swim">swim</span>. <span word="He">He</span> <span word="can">can</span> <span word="dance">dance</span>. --- <span word="He">He</span> <span word="cant">cant</span> <span word="dance">dance</span>. <span word="You">You</span> <span word="should">should</span> <span word="go">go</span> <span word="to">to</span> <span word="school">school</span> <span word="at">at</span> <span word="seven">seven</span>. --- <span word="You">You</span> <span word="shouldnt">shouldnt</span> <span word="go">go</span> <span word="to">to</span> <span word="school">school</span> <span word="at">at</span> <span word="seven">seven</span>.</p><p> 3. 实义动词的否定句</p><p> 实义动词变否定句时，要借助助动词<span word="do">do</span> , <span word="does">does</span>，在一般现在时中用<span word="do">do</span>或者<span word="does">does</span>其句子结构为：主语+ <span word="dont">dont</span> / <span word="doesnt">doesnt</span> + 动词原形+其它 例如：</p><p> <span word="I">I</span> <span word="like">like</span> <span word="pop">pop</span> <span word="music">music</span>. --- <span word="I">I</span> <span word="dont">dont</span> <span word="like">like</span> <span word="pop">pop</span> <span word="music">music</span>. <span word="He">He</span> <span word="likes">likes</span> <span word="running">running</span>. --- <span word="He">He</span> <span word="doesnt">doesnt</span> <span word="like">like</span> <span word="running">running</span>.</p><p> <span word="She">She</span> <span word="does">does</span> <span word="her">her</span> <span word="homework">homework</span> <span word="at">at</span> <span word="home">home</span>. --- <span word="She">She</span> <span word="doesnt">doesnt</span> <span word="do">do</span> <span word="her">her</span> <span word="homework">homework</span> <span word="at">at</span> <span word="home">home</span></p>
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