现在完成式
<p> 一、现在完成式表示到现在为止已完成或仍在持续的动作、状态；强调对现在的影响、联系,或表示经历、经验即用过去发生的动作来说明现在的情况。</p><p> 二、现在完成式用在过去已完成而其结果对现在仍有影响的动作来说明经历、经验,或表示某种感情色彩。</p><p> 三、当现在完成式表示从过去某时持续到现在的动作或状态,以说明经历、经验,与<span word="for">for</span>或<span word="since">since</span>引导的表示一段时间的副词片语连用时,述语动词要用<span word="be">be</span>, <span word="keep">keep</span>, <span word="learn">learn</span>, <span word="live">live</span>, <span word="read">read</span>, <span word="serve">serve</span>, <span word="stay">stay</span>, <span word="study">study</span>, <span word="teach">teach</span>, <span word="watch">watch</span>, <span word="work">work</span>, <span word="write">write</span>等表示持续的动词,不可使用<span word="arrive">arrive</span>, <span word="become">become</span>, <span word="begin">begin</span>, <span word="borrow">borrow</span>, <span word="buy">buy</span>, <span word="come">come</span>, <span word="close">close</span>, <span word="die">die</span>, <span word="end">end</span>, <span word="enter">enter</span>, <span word="get">get</span>, <span word="go">go</span>, <span word="hear">hear</span>, <span word="graduate">graduate</span>, <span word="join">join</span>, <span word="leave">leave</span>, <span word="lend">lend</span>, <span word="lose">lose</span>, <span word="marry">marry</span>, <span word="open">open</span>, <span word="put">put</span>, <span word="reach">reach</span>, <span word="receive">receive</span>, <span word="return">return</span>, <span word="see">see</span>, <span word="shut">shut</span>, <span word="start">start</span>, <span word="stop">stop</span>等表示终止的动词。</p><p> 1. <span word="It">It</span> <span word="has">has</span> <span word="been">been</span> <span word="a">a</span> <span word="long">long</span> <span word="and">and</span> <span word="tiring">tiring</span> <span word="day">day</span> <span word="today">today</span>.</p><p> 今天真是够累的。</p><p> 现在完成式表示到现在为止已完成或仍在持续的动作、状态；强调对现在的影响、联系。</p><p> 2. <span word="Where">Where</span> <span word="have">have</span> <span word="you">you</span> <span word="gone">gone</span>, <span word="mom">mom</span>?（错误）</p><p> 你去哪里去了,妈妈?</p><p> 表示终止的动词如<span word="die">die</span>, <span word="go">go</span>等不可用完成式表示从过去某时持续到现在的动作或状态。<span word="have">have</span> <span word="gone">gone</span>表示所提到 的人现在已不在本地,上句是错误的,不符合逻辑。</p><p> 3. <span word="I">I</span> <span word="mean">mean</span>, <span word="where">where</span> <span word="have">have</span> <span word="you">you</span> <span word="been">been</span>, <span word="mom">mom</span>?</p>
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