现在完成时
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现在完成时篇1:现在完成时是什么?
have/has done是xz完成时 had done是g过去完成时
现在完成时篇2:现在完成时的含义和用法.
现在完成时表示过去开始,但持续到现在的动作,或过去发生的动作,对现在留下后果或影响.常和for+一段时间,already,ever,never,just,yet,in the past few years/ over the last thirty years,so far,up to now,since 1980等状语连用.基本结构：主语+have/has+动词的过去分词(p.p)（V-ed） e.g done ①否定句：主语+have/has+not+动词的过去分词(p.p)（V-ed）+宾语.②肯定句：主语+have/has+动词的过去分词(p.p)（V-ed）+宾语.③特殊疑问句：特殊疑问词或词组+一般疑问句（have/has+主语+过去分词（V-ed）+其他）④一般疑问句：Have/Has+主语+动词的过去分词(p.p)（V-ed）+宾语.
现在完成时篇3:什么现在完成时 现在完成时的结构 现在完成时要注意哪些
现在完成时 指着眼于现在 强调过去的动作对现在造成影响句型：This is the first/best/the only book that I have ever read.It has been three years since I learnt English.=it is three years since I leant English.4过去完成时 是指过去的过去Hardly /scarcely had I arrived at the station when the bus left.No sooner had I arrived at the station than the bus left.特例：hope,wish,expect,think,intend,mean,suppose用过去完成时表示"原本… had expected,had intended 表示本期盼,本打算句型：No sooner than hardly/scarcely when No sooner had he arrived at the station than the bus left
