从零开始学语法：如何表达本来该做某事？
<p> <span word="should">should</span> <span word="have">have</span> <span word="done">done</span></p><p> <span word="should">should</span> <span word="have">have</span> + 动词的完成式表示本应该做而实际上没有做，它的否定形式表示某种行为本不该发生但却发生了。有责备的意味。</p><p> <span word="You">You</span> <span word="should">should</span> <span word="have">have</span> <span word="started">started</span> <span word="earlier">earlier</span>, <span word="but">but</span> <span word="you">you</span> <span word="didnt">didnt</span>.</p><p> 你本应该早点儿出发，但是你没有。</p><p> <span word="You">You</span> <span word="should">should</span> <span word="have">have</span> <span word="washed">washed</span> <span word="the">the</span> <span word="wound">wound</span>.</p><p> 你应该已经洗好了伤口。</p><p> <span word="She">She</span> <span word="shouldnt">shouldnt</span> <span word="have">have</span> <span word="taken">taken</span> <span word="away">away</span> <span word="my">my</span> <span word="dictionary">dictionary</span>, <span word="for">for</span> <span word="I">I</span> <span word="wanted">wanted</span> <span word="to">to</span> <span word="use">use</span> <span word="it">it</span>.</p><p> 她本不应该拿走我的词典，因为我要用它。</p><p> <span word="You">You</span> <span word="shouldnt">shouldnt</span> <span word="have">have</span> <span word="been">been</span> <span word="so">so</span> <span word="rude">rude</span> <span word="to">to</span> <span word="him">him</span>.</p><p> 你本不应该对他那么粗鲁。</p><p> 注：<span word="should">should</span> <span word="have">have</span> + 完成式虽然可以表猜测，但因为会造成歧义，应少用。</p><p> <span word="ought">ought</span> <span word="to">to</span> <span word="have">have</span> <span word="done">done</span></p><p> 1、<span word="ought">ought</span> <span word="to">to</span> <span word="have">have</span> + 动词的完成式表示过去应做某事而实际未做，它的否定形式表示本不应该做某事却做了(用法和<span word="should">should</span>相同)。</p><p> <span word="You">You</span> <span word="ought">ought</span> <span word="to">to</span> <span word="have">have</span> <span word="helped">helped</span> <span word="him">him</span>, <span word="but">but</span> <span word="you">you</span> <span word="didnt">didnt</span>.</p><p> 你本应该帮助他但你没有。</p><p> <span word="You">You</span> <span word="ought">ought</span> <span word="to">to</span> <span word="have">have</span> <span word="studied">studied</span> <span word="harder">harder</span>.</p><p> 你本应该更努力学习的。</p><p> <span word="He">He</span> <span word="ought">ought</span> <span word="not">not</span> <span word="to">to</span> <span word="have">have</span> <span word="stopped">stopped</span> <span word="his">his</span> <span word="work">work</span> <span word="halfway">halfway</span>.</p><p> 他本不应该做这项工作时半途而废。</p>
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