英语专业四级考试词汇知识点辅导:动词完成式
<p>1．<span word="may">may</span>和<span word="might">might</span>＋动词完成式</p><p> 此结构用于推测过去的行为。例如：</p><p> <span word="She">She</span> <span word="said">said</span> <span word="that">that</span> <span word="he">he</span> <span word="might">might</span> <span word="have">have</span> <span word="missed">missed</span> <span word="the">the</span> <span word="plane">plane</span>.她说他可能误了航班。</p><p> 2．<span word="can">can</span>和<span word="could">could</span>＋动词完成式</p><p> <span word="A">A</span>．表示过去能做而没做的事，有一种对过去未付诸实施的事情的惋惜。例如：</p><p> <span word="In">In</span> <span word="those">those</span> <span word="circumstances">circumstances</span> <span word="we">we</span> <span word="could">could</span> <span word="have">have</span> <span word="done">done</span> <span word="better">better</span>.</p><p> 在那样的情况下，我们本来可以做得更好的。（但没有做得更好）</p><p> <span word="B">B</span>．推测过去的某种行动。</p><p> <span word="Where">Where</span> <span word="can">can</span> /<span word="could">could</span> <span word="she">she</span> <span word="have">have</span> <span word="gone">gone</span>? 她可能到哪里去了呢？</p><p> <span word="The">The</span> <span word="boy">boy</span> <span word="cant">cant</span> <span word="have">have</span> <span word="finished">finished</span> <span word="reading">reading</span> <span word="the">the</span> <span word="book">book</span> <span word="so">so</span> <span word="soon">soon</span> <span word="because">because</span> <span word="it">it</span> <span word="is">is</span> <span word="difficult">difficult</span> <span word="even">even</span> <span word="to">to</span> <span word="an">an</span> <span word="adult">adult</span>.</p><p> 这孩子不可能那么快就把这本书读完的，因为即使对一个成人来说，这本书也是相当难的。</p><p> <span word="Note">Note</span>：</p><p> <span word="cant">cant</span>和<span word="couldnt">couldnt</span>＋动词原形可以用来表示否定推断。例如：</p><p> <span word="He">He</span> <span word="cant">cant</span> <span word="be">be</span> <span word="over">over</span> <span word="fifty">fifty</span>.他不可能超过50岁。</p><p> 3.<span word="must">must</span>＋动词完成式</p><p> 表示对过去行为的推断，具有较大的可能性，意为一定，想必。例如：</p><p> <span word="She">She</span> <span word="must">must</span> <span word="have">have</span> <span word="gone">gone</span> <span word="through">through</span> <span word="a">a</span> <span word="lot">lot</span>.</p><p> 她一定吃过很多苦。</p><p> <span word="Note">Note</span>：</p>
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