英语六级基础语法辅导精华助动词
<p> 英语六级基础语法辅导精华：助动词</p><p> 汉语中只有助词，而没有助动词。这又是英汉两种语言的一大差别。英语的助动词，就是起辅助作用的动词，本身没有独立的词义，不能单独做谓语，在句子中只起语法作用，和实意动词一起构成谓语(叫复合谓语)，表达否定，疑问，时态，语态和其他语法关系。其基本形式和作用如下表：</p><p> (一)助动词<span word="be">be</span>的用法</p><p> 1、跟现在分词构成各种进行时态：</p><p> <span word="They">They</span> <span word="are">are</span> <span word="playing">playing</span> <span word="war">war</span> <span word="games">games</span> <span word="with">with</span> <span word="toy">toy</span> <span word="guns">guns</span> <span word="and">and</span> <span word="toy">toy</span> <span word="tanks">tanks</span>. 他们正在用玩具枪和玩具坦克玩战争游戏。</p><p> <span word="We">We</span> <span word="were">were</span> <span word="playing">playing</span> <span word="video">video</span> <span word="games">games</span> <span word="on">on</span> <span word="TV">TV</span> <span word="last">last</span> <span word="night">night</span>. 昨晚我们在电视上玩电子游戏。</p><p> 2、跟过去分词构成被动语态：</p><p> <span word="Hes">Hes</span> <span word="not">not</span> <span word="respected">respected</span> <span word="by">by</span> <span word="the">the</span> <span word="press">press</span>. 他们不受报界的尊重。</p><p> <span word="We">We</span> <span word="were">were</span> <span word="taught">taught</span> <span word="how">how</span> <span word="to">to</span> <span word="use">use</span> <span word="a">a</span> <span word="computer">computer</span> <span word="last">last</span> <span word="year">year</span>. 去年教过我们怎样用计算机。</p><p> (二)助动词<span word="have">have</span>的用法</p><p> <span word="have">have</span>后面跟过去分词构成各种完成时态:</p><p> <span word="Weve">Weve</span> <span word="known">known</span> <span word="each">each</span> <span word="other">other</span> <span word="since">since</span> <span word="three">three</span> <span word="years">years</span> <span word="ago">ago</span>. 我们从三年前就认识了。</p><p> <span word="Hes">Hes</span> <span word="been">been</span> <span word="to">to</span> <span word="Shanghai">Shanghai</span>. 他去过上海。</p><p> (三)助动词<span word="do">do</span>的用法</p><p> 1、帮助构成实意动词一般现在时和一般过去时的疑问式和否定式：</p>
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