从零开始学语法：can have done用法小结
<p> <span word="can">can</span> <span word="have">have</span> <span word="done">done</span></p><p> <span word="can">can</span> <span word="have">have</span></p><p> <span word="done">done</span></p><p> 通常只用于否定句和疑问句。用于否定句时表否定推断，推测肯定没做;用于疑问句时意为难道真的做了吗，表示怀疑。例如：</p><p> <span word="Can">Can</span> <span word="he">he</span> <span word="have">have</span> <span word="done">done</span> <span word="such">such</span> <span word="a">a</span> <span word="foolish">foolish</span> <span word="thing">thing</span>? (= <span word="Is">Is</span> <span word="it">it</span> <span word="possible">possible</span> ?)</p><p> 他会做这样的傻事吗?(表怀疑)</p><p> <span word="He">He</span> <span word="cant">cant</span> <span word="have">have</span> <span word="taken">taken</span> <span word="it">it</span> <span word="home">home</span>.</p><p> 他不可能把它带回家了。(表不可能)</p><p> <span word="could">could</span> <span word="have">have</span> <span word="done">done</span></p><p> <span word="could">could</span> <span word="have">have</span> <span word="done">done</span> 可用于肯定句、疑问句和否定句。用于肯定句既可以表示过去能够做而实际未做，有惋惜、遗憾或委婉批评之意，也可以表示对过去动作的推测;用于否定句和疑问句的情况与can have done相同。例如：</p><p> <span word="You">You</span> <span word="could">could</span> <span word="have">have</span> <span word="done">done</span> <span word="better">better</span>, <span word="but">but</span> <span word="you">you</span> <span word="didnt">didnt</span> <span word="try">try</span> <span word="your">your</span> <span word="best">best</span>.</p><p> 你本可以做得更好，但是你没有尽力而为。(表惋惜)</p><p> <span word="This">This</span> <span word="glass">glass</span> <span word="is">is</span> <span word="cracked">cracked</span>. <span word="Someone">Someone</span> <span word="could">could</span> <span word="have">have</span> <span word="dropped">dropped</span> <span word="it">it</span>.</p><p> 这个玻璃杯破了。可能是谁把它掉在地上了。(表推测过去)</p><p> <span word="Could">Could</span> <span word="he">he</span> <span word="have">have</span> <span word="left">left</span> <span word="the">the</span> <span word="work">work</span> <span word="unfinished">unfinished</span>?</p><p> 他会丢下工作不干了?(表怀疑)</p><p> <span word="He">He</span> <span word="couldnt">couldnt</span> <span word="have">have</span> <span word="checked">checked</span> <span word="out">out</span> <span word="so">so</span> <span word="early">early</span>.</p><p> 他不可能这么早就离开了。(表不可能)</p>
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