［虚拟语气］非真实条件句
<p> 1）虚拟语气可以表示过去，现在和将来的情况，时态的基本特点是时态往后推移。</p><p> <span word="a">a</span>. 与现在事实相反的假设</p><p> 条件从句 主句 一般过去时（<span word="be">be</span>用<span word="were">were</span>） <span word="should">should</span>（<span word="would">would</span>）等 +动词原形</p><p> 例如：<span word="If">If</span> <span word="they">they</span> <span word="were">were</span> <span word="here">here</span>， <span word="they">they</span> <span word="would">would</span> <span word="help">help</span> <span word="you">you</span>. 如果他们在这儿，会帮助你的。</p><p> 含义：<span word="They">They</span> <span word="are">are</span> <span word="not">not</span> <span word="here">here</span>， <span word="they">they</span> <span word="cant">cant</span> <span word="help">help</span> <span word="you">you</span>.</p><p> <span word="b">b</span>. 与过去事实相反的假设</p><p> 条件从句 主句 过去完成时 <span word="should">should</span>（<span word="would">would</span>）等+ <span word="have">have</span>+ 过去分词</p><p> 例如：<span word="If">If</span> <span word="he">he</span> <span word="had">had</span> <span word="come">come</span> <span word="yesterday">yesterday</span>， <span word="I">I</span> <span word="should">should</span> / <span word="would">would</span> <span word="have">have</span> <span word="told">told</span> <span word="him">him</span> <span word="about">about</span> <span word="it">it</span>.如果他昨天来的话，我会把这件事告诉他的。</p><p> 含义：<span word="He">He</span> <span word="did">did</span> <span word="not">not</span> <span word="come">come</span> <span word="yesterday">yesterday</span>， <span word="so">so</span> <span word="I">I</span> <span word="did">did</span> <span word="not">not</span> <span word="tell">tell</span> <span word="him">him</span> <span word="about">about</span> <span word="it">it</span>.</p><p> <span word="c">c</span>. 表示对将来不大可能发生的事情的假想</p><p> 条件从句 主句 一般过去时 <span word="should">should</span>/<span word="would">would</span>等 + 动词原形 <span word="were">were</span>+ 不定式 <span word="should">should</span>+ 动词原形</p><p> 例如：<span word="If">If</span> <span word="you">you</span> <span word="succeeded">succeeded</span>， <span word="everything">everything</span> <span word="would">would</span> <span word="be">be</span> <span word="all">all</span> <span word="right">right</span>. 如果你将来成功了，一切都会好的。</p><p> <span word="If">If</span> <span word="you">you</span> <span word="should">should</span> <span word="succeed">succeed</span>， <span word="everything">everything</span> <span word="would">would</span> <span word="be">be</span> <span word="all">all</span> <span word="right">right</span>.</p><p> <span word="If">If</span> <span word="you">you</span> <span word="were">were</span> <span word="to">to</span> <span word="succeed">succeed</span>， <span word="everything">everything</span> <span word="would">would</span> <span word="be">be</span> <span word="all">all</span> <span word="right">right</span>.</p>
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