初中英语语法几大基本时态讲与练（2）
<p> 大家知道，谓语的动词用来表示动作(情况)发生时间的各种形式称为时态。</p><p> 现在进行时表示：1、现在(说话的瞬间)正在进行或发生的动作，强调此时此刻。<span word="E">E</span>.<span word="g">g</span>. <span word="He">He</span> <span word="is">is</span> <span word="reading">reading</span> . <span word="They">They</span> <span word="are">are</span> <span word="talking">talking</span> <span word="now">now</span>.</p><p> 2、当前一段时间内的活动或现阶段正在进行的动作。<span word="E">E</span>.<span word="g">g</span>. <span word="They">They</span> <span word="are">are</span> <span word="working">working</span> <span word="these">these</span> <span word="days">days</span>.</p><p> 3、某些动词的现在进行时，表预定的计划或即将发生的动作。<span word="E">E</span>.<span word="g">g</span> <span word="I">I</span> <span word="am">am</span> <span word="coming">coming</span>.</p><p> 其结构为<span word="be">be</span>+现在分词. 现在分词的变法有：</p><p> 1、一般在动词词尾加上-<span word="ing">ing</span> , <span word="E">E</span>.<span word="g">g</span>. <span word="jump">jump</span></p><p> 2、以不发音字母<span word="e">e</span>结尾的动词，先去<span word="e">e</span>，再加-<span word="ing">ing</span>. <span word="E">E</span>.<span word="g">g</span> <span word="have">have</span> <span word="write">write</span></p><p> 3、.以重读闭音节末尾只有一个辅音字母结尾的词，它前面是单个元音字母时要先将词尾的辅音字母双写，再加上-<span word="ing">ing</span>. <span word="E">E</span>.<span word="g">g</span>. <span word="sit">sit</span> <span word="put">put</span></p><p> 其句式变换都在<span word="be">be</span>上做文章。</p><p> <span word="E">E</span>.<span word="g">g</span>. <span word="He">He</span> <span word="is">is</span> <span word="buying">buying</span> <span word="a">a</span> <span word="bike">bike</span>.</p><p> <span word="Is">Is</span> <span word="he">he</span> <span word="buying">buying</span> <span word="a">a</span> <span word="bike">bike</span>?</p><p> <span word="He">He</span> <span word="isnt">isnt</span> <span word="buying">buying</span> <span word="a">a</span> <span word="bike">bike</span>.</p><p> 一般由<span word="look">look</span>,<span word="listen">listen</span>,<span word="now">now</span>, <span word="at">at</span> <span word="this">this</span> <span word="moment">moment</span>等时间状语做标志。</p><p> 尽管现在进行时比较简单，但在做题过程中也常会犯一些错误，常见的错误有如下几种：</p><p> 自我检测</p><p> (一) 、单选</p><p> 1、 <span word="Look">Look</span>! <span word="He">He</span> _____<span word="their">their</span> <span word="mother">mother</span> <span word="do">do</span> <span word="the">the</span> <span word="housework">housework</span>.</p>
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