初中英语语法几大基本时态讲与练（1）
<p> 一般现在时是英语中应用最广泛的时态之一，是初中英语语法重点。它表示1)经常性、习惯性的动作或存在的状态。<span word="e">e</span>.<span word="g">g</span>. <span word="I">I</span> <span word="go">go</span> <span word="to">to</span> <span word="school">school</span> <span word="on">on</span> <span word="foot">foot</span>. <span word="He">He</span> <span word="is">is</span> <span word="very">very</span> <span word="busy">busy</span> <span word="now">now</span>. 2)表示主语的特征、性格、能力、爱好等。<span word="e">e</span>.<span word="g">g</span>. <span word="He">He</span> <span word="can">can</span> <span word="swim">swim</span>. <span word="I">I</span> <span word="work">work</span> <span word="hard">hard</span>. <span word="I">I</span> <span word="like">like</span> <span word="watching">watching</span> <span word="TV">TV</span>. 3)表示客观真理 <span word="e">e</span>.<span word="g">g</span>. <span word="There">There</span> <span word="are">are</span> <span word="seven">seven</span> <span word="days">days</span> <span word="in">in</span> <span word="a">a</span> <span word="week">week</span>. <span word="The">The</span> <span word="moon">moon</span> <span word="moves">moves</span> <span word="round">round</span> <span word="the">the</span> <span word="earth">earth</span>.</p><p> 其结构按正常语序，即主语+谓语+其它，有时为了起强调作用，时间状语也可提前.</p><p> 其句式变化可分为两种情况 1)表示动作， 一般人称作主语的，变否定句须在动词前加助动词<span word="don">don</span>变一般疑问句须在句首加助动词<span word="do">do</span>。 <span word="E">E</span>.<span word="g">g</span>. <span word="They">They</span> <span word="have">have</span> <span word="lunch">lunch</span> <span word="at">at</span> 12:00. <span word="They">They</span> <span word="dont">dont</span> <span word="have">have</span> <span word="lunch">lunch</span> <span word="at">at</span> 12:00. <span word="Do">Do</span> <span word="they">they</span> <span word="have">have</span> <span word="lunch">lunch</span> <span word="at">at</span> 12:00? 2)单三人称做主语的，变否定句须在动词前加助动词<span word="doesn">doesn</span>变一般疑问句须在句首加助动词<span word="does">does</span>。</p><p> <span word="E">E</span>.<span word="g">g</span>. <span word="Jenny">Jenny</span> <span word="speaks">speaks</span> <span word="English">English</span> <span word="very">very</span> <span word="well">well</span>.</p><p> <span word="Jenny">Jenny</span> <span word="doesnt">doesnt</span> <span word="speak">speak</span> <span word="English">English</span> <span word="very">very</span> <span word="well">well</span>.</p><p> <span word="Does">Does</span> <span word="Jenny">Jenny</span> <span word="speak">speak</span> <span word="English">English</span> <span word="very">very</span> <span word="well">well</span>?</p><p> 含有<span word="be">be</span>动词的要在<span word="be">be</span>上做变化.</p><p> <span word="E">E</span>.<span word="g">g</span>. <span word="Danny">Danny</span> <span word="is">is</span> <span word="a">a</span> <span word="good">good</span> <span word="student">student</span>.</p><p> <span word="Danny">Danny</span> <span word="isnt">isnt</span> <span word="a">a</span> <span word="good">good</span> <span word="student">student</span>.</p><p> <span word="Is">Is</span> <span word="Danny">Danny</span> <span word="a">a</span> <span word="good">good</span> <span word="student">student</span>?</p><p> 其时间状语为<span word="often">often</span>、 <span word="usually">usually</span>、 <span word="always">always</span>、 <span word="sometimes">sometimes</span>等频率副词，<span word="on">on</span> <span word="Saturdays">Saturdays</span>、 <span word="in">in</span> <span word="the">the</span> <span word="morning">morning</span>(<span word="afternoon">afternoon</span> <span word="evening">evening</span>) 、<span word="every">every</span> <span word="day">day</span> 等。</p>
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