should的具体用法
<p> 在英语语法的学习中，<span word="should">should</span>也是高频词汇之一，那么关于<span word="should">should</span>的具体用法是什么呢?下面进行详细讲解：</p><p> 一 . <span word="should">should</span> 作为助动词 <span word="shall">shall</span> 的过去式，可以在间接引语中与第一人称主语搭配，表示过去将来时间。例如：</p><p> <span word="The">The</span> <span word="group">group</span> <span word="leader">leader</span> <span word="announced">announced</span> <span word="that">that</span> <span word="we">we</span> <span word="should">should</span> (= <span word="would">would</span> ) <span word="begin">begin</span> <span word="to">to</span> <span word="work">work</span> <span word="soon">soon</span>.</p><p> 小组长宣布：我们不久就开始工作。</p><p> <span word="A">A</span> <span word="week">week</span> <span word="ago">ago</span>， <span word="I">I</span> <span word="told">told</span> <span word="him">him</span> <span word="that">that</span> <span word="I">I</span> <span word="should">should</span> (= <span word="would">would</span>) <span word="go">go</span> <span word="to">to</span> <span word="Beijing">Beijing</span> <span word="the">the</span> <span word="next">next</span> <span word="day">day</span>.</p><p> 一个星期以前，我告诉他我第二天就去北京。</p><p> 二 . <span word="should">should</span> 作为情态动词，通常用来表示现在或将来的责任或义务，译作&<span word="ldquo">ldquo</span>;应该、&<span word="ldquo">ldquo</span>;应当，这时它可以和 <span word="ought">ought</span> <span word="to">to</span>， <span word="be">be</span> <span word="supposed">supposed</span> <span word="to">to</span> 互换使用。例如：</p><p> <span word="You">You</span> <span word="should">should</span> (= <span word="are">are</span> <span word="supposed">supposed</span> <span word="to">to</span> ) <span word="complete">complete</span> <span word="your">your</span> <span word="test">test</span> <span word="in">in</span> <span word="time">time</span>.</p><p> 你们应该按时做完你们的实验。</p><p> <span word="You">You</span> <span word="should">should</span> (= <span word="ought">ought</span> <span word="to">to</span> ) <span word="tell">tell</span> <span word="your">your</span> <span word="mother">mother</span> <span word="about">about</span> <span word="it">it</span> <span word="at">at</span> <span word="once">once</span>.</p><p> 你应该立即把此事告诉你妈妈。</p><p> <span word="In">In</span> <span word="sum">sum</span>， <span word="theory">theory</span> <span word="should">should</span> <span word="be">be</span> <span word="combined">combined</span> <span word="with">with</span> <span word="practice">practice</span>.</p><p> 总之，理论应该与实验相结合。</p><p> 三 . <span word="should">should</span> 作为情态动词，可以用在条件状语从句中，表示语气较强的假设，译作&<span word="ldquo">ldquo</span>;万一、&<span word="ldquo">ldquo</span>;竟然，这时也可将 <span word="should">should</span> 置于从句之首，即将 <span word="should">should</span> 放在主语前面，而省略从属连词 <span word="if">if</span> .例如：</p>
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