［状语从句］比较until和till
<p> 此两个连词意义相同。肯定形式表示的意思是做某事直至某时，动词必须是延续性的。否定形式表达的意思是直至某时才做某事.动词为延续性或非延续性都可以。正确使用这两个连词的关键之一就在于判断句中的动词该用肯定式还是否定式。肯定句：<span word="I">I</span> <span word="slept">slept</span> <span word="until">until</span> <span word="midnight">midnight</span>. 我一直睡到半夜时醒了。</p><p> <span word="Wait">Wait</span> <span word="till">till</span> <span word="I">I</span> <span word="call">call</span> <span word="you">you</span>. 等着我叫你。（在肯定句中可用<span word="before">before</span>代替。例如 <span word="Lets">Lets</span> <span word="get">get</span> <span word="in">in</span> <span word="the">the</span> <span word="wheat">wheat</span> <span word="before">before</span> <span word="the">the</span> <span word="sun">sun</span> <span word="sets">sets</span>.）</p><p> 否定句：<span word="She">She</span> <span word="didnt">didnt</span> <span word="arrive">arrive</span> <span word="until">until</span> 6 <span word="oclock">oclock</span>. 她直到6点才到。</p><p> <span word="Dont">Dont</span> <span word="get">get</span> <span word="off">off</span> <span word="the">the</span> <span word="bus">bus</span> <span word="until">until</span> <span word="it">it</span> <span word="has">has</span> <span word="stopped">stopped</span>. 公共汽车停稳后再下车。</p><p> <span word="I">I</span> <span word="didnt">didnt</span> <span word="manage">manage</span> <span word="to">to</span> <span word="do">do</span> <span word="it">it</span> <span word="until">until</span> <span word="you">you</span> <span word="had">had</span> <span word="explained">explained</span> <span word="how">how</span>. 直到你教我后，我才会做。</p><p> 区别：1）<span word="until">until</span>可用于句首，而<span word="till">till</span>通常不用于句首。例如：</p><p> <span word="Until">Until</span> <span word="you">you</span> <span word="told">told</span> <span word="me">me</span>， <span word="I">I</span> <span word="had">had</span> <span word="heard">heard</span> <span word="nothing">nothing</span> <span word="of">of</span> <span word="what">what</span> <span word="happened">happened</span>. 直到你告诉我以前，出了什么事我一点也不知道。</p><p> 2）<span word="until">until</span> <span word="when">when</span> 疑问句中，<span word="until">until</span>要放在句首。例如：</p><p> <span word="Until">Until</span> <span word="when">when</span> <span word="are">are</span> <span word="you">you</span> <span word="staying">staying</span>？ 你呆到什么时候？</p><p> <span word="Until">Until</span> <span word="next">next</span> <span word="Monday">Monday</span>. 呆到下周一。</p><p> 注意：否定句可用另外两种句式表示。</p><p> 1）<span word="Not">Not</span> <span word="until">until</span>在句首，主句用倒装。例如：</p><p> <span word="Not">Not</span> <span word="until">until</span> <span word="the">the</span> <span word="early">early</span> <span word="years">years</span> <span word="of">of</span> <span word="the">the</span> 19<span word="th">th</span> <span word="century">century</span> <span word="did">did</span> <span word="man">man</span> <span word="know">know</span> <span word="what">what</span> <span word="heat">heat</span> <span word="is">is</span>. 直到19 世纪初，人类才知道热为何物。</p>
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