助动词have的用法
<p>1）<span word="have">have</span> +过去分词，构成完成时态，例如： </p><p> <span word="He">He</span> <span word="has">has</span> <span word="left">left</span> <span word="for">for</span> <span word="London">London</span>. 他已去了伦敦。 </p><p> <span word="By">By</span> <span word="the">the</span> <span word="end">end</span> <span word="of">of</span> <span word="last">last</span> <span word="month">month</span>, <span word="they">they</span> <span word="had">had</span> <span word="finished">finished</span> <span word="half">half</span> <span word="of">of</span> <span word="their">their</span> <span word="work">work</span>. </p><p> 上月未为止，他们已经完成工作的一半。 </p><p>2）<span word="have">have</span> + <span word="been">been</span> +现在分词，构成完成进行时，例如： <span word="http">http</span>://<span word="yingyu">yingyu</span>.<span word="chazidian">chazidian</span>.<span word="com">com</span></p><p> <span word="I">I</span> <span word="have">have</span> <span word="been">been</span> <span word="studying">studying</span> <span word="English">English</span> <span word="for">for</span> <span word="ten">ten</span> <span word="years">years</span>. </p><p> 我一直在学英语，已达十年之久。 </p><p>3）<span word="have">have</span>+<span word="been">been</span> +过去分词，构成完成式被动语态，例如： </p><p> <span word="English">English</span> <span word="has">has</span> <span word="been">been</span> <span word="taught">taught</span> <span word="in">in</span> <span word="China">China</span> <span word="for">for</span> <span word="many">many</span> <span word="years">years</span>. </p><p> 中国教英语已经多年 </p></p>
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