现在进行时的应用
<p>现在进行时的基本用法：</p><p><span word="a">a</span>. 表示现在( 指说话人说话时) 正在发生的事情。</p><p><span word="We">We</span> <span word="are">are</span> <span word="waiting">waiting</span> <span word="for">for</span> <span word="you">you</span>.</p><p><span word="b">b</span>. 习惯进行：表示长期的或重复性的动作，说话时动作未必正在进行。</p><p><span word="Mr">Mr</span>. <span word="Green">Green</span> <span word="is">is</span> <span word="writing">writing</span> <span word="another">another</span> <span word="novel">novel</span>.</p><p>(说话时并未在写，只处于写作的状态。)</p><p><span word="She">She</span> <span word="is">is</span> <span word="learning">learning</span> <span word="piano">piano</span> <span word="under">under</span> <span word="Mr">Mr</span>. <span word="Smith">Smith</span>.</p><p><span word="c">c</span>. 表示渐变的动词有：<span word="get">get</span>, <span word="grow">grow</span>, <span word="become">become</span>, <span word="turn">turn</span>, <span word="run">run</span>, <span word="go">go</span>, <span word="begin">begin</span>等。</p><p><span word="The">The</span> <span word="leaves">leaves</span> <span word="are">are</span> <span word="turning">turning</span> <span word="red">red</span>.</p><p><span word="It">It</span>'<span word="s">s</span> <span word="getting">getting</span> <span word="warmer">warmer</span> <span word="and">and</span> <span word="warmer">warmer</span>.</p><p><span word="d">d</span>. 与<span word="always">always</span>, <span word="constantly">constantly</span>, <span word="forever">forever</span> 等词连用，表示反复发生的动作或持续存在的状态，往往带有说话人的主观色彩。</p><p><span word="You">You</span> <span word="are">are</span> <span word="always">always</span> <span word="changing">changing</span> <span word="your">your</span> <span word="mind">mind</span>.</p><p>典型例题</p><p><span word="My">My</span> <span word="dictionary">dictionary</span> ___, <span word="I">I</span> <span word="have">have</span> <span word="looked">looked</span> <span word="for">for</span> <span word="it">it</span> <span word="everywhere">everywhere</span> <span word="but">but</span> <span word="still">still</span>___ <span word="it">it</span>.</p><p><span word="A">A</span>. <span word="has">has</span> <span word="lost">lost</span>, <span word="don">don</span>'<span word="t">t</span> <span word="find">find</span> <span word="B">B</span>. <span word="is">is</span> <span word="missing">missing</span>, <span word="don">don</span>'<span word="t">t</span> <span word="find">find</span> <span word="C">C</span>. <span word="has">has</span> <span word="lost">lost</span>, <span word="haven">haven</span>'<span word="t">t</span> <span word="found">found</span> <span word="D">D</span>. <span word="is">is</span> <span word="missing">missing</span>, <span word="haven">haven</span>'<span word="t">t</span> <span word="found">found</span>.</p><p>答案<span word="D">D</span>. 前句是一个仍在持续的状态，应用进行时，由于没有找到，其影响仍然存在，应用完成时，瞬间动词用于否定式时可用于完成时。</p>
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