英语语法：虚拟语气的用法
<p> 在英语语法的学习中有很多的难点，虚拟语气也是一个难点。所谓虚拟语气是表示说话人的愿望、假设、猜测或建议，而不表示客观存在的事实。它通过句子的谓语动词的特殊形式来表示。现归纳如下：纯假设，用虚拟，动词时态退一级：条件句，分主从，主句谓语前加<span word="would">would</span> (<span word="should">should</span>, <span word="could">could</span>，<span word="might">might</span>);表愿望,用虚拟，<span word="wish">wish</span>后面接宾语(从句)：现在过去与将来，动词时态退一级：提建议，用虚拟，宾语(从句)动词用(<span word="should">should</span>)<span word="do">do</span>：俩建议，三要求，再加坚持与命令(<span word="suggest">suggest</span>, <span word="advise">advise</span>, <span word="demand">demand</span>, <span word="require">require</span>, <span word="request">request</span>, <span word="Insist">Insist</span>, <span word="order">order</span>)：<span word="It">It</span> <span word="is">is</span> <span word="time">time</span>和<span word="would">would</span> <span word="rather">rather</span>,后接丛句用虚拟：部分主语从句中， 谓语用虚拟结构 (<span word="It">It</span> <span word="is">is</span> <span word="necessary">necessary</span> /<span word="important">important</span>/<span word="natural">natural</span>/<span word="natural">natural</span>/<span word="strange">strange</span>/<span word="strange">strange</span> <span word="that">that</span>&<span word="hellip">hellip</span>;&<span word="hellip">hellip</span>;<span word="should">should</span> <span word="do">do</span>)。 下面举例说明：</p><p> <span word="A">A</span>、<span word="If">If</span> <span word="you">you</span> <span word="came">came</span> <span word="tomorrow">tomorrow</span>, <span word="we">we</span> <span word="would">would</span> <span word="have">have</span> <span word="the">the</span> <span word="meeting">meeting</span>. (条件句虚拟)</p><p> <span word="B">B</span>、<span word="Without">Without</span> <span word="air">air</span>, <span word="there">there</span> <span word="would">would</span> <span word="be">be</span> <span word="no">no</span> <span word="living">living</span> <span word="things">things</span>.(同上)</p><p> <span word="C">C</span>、<span word="We">We</span> <span word="wish">wish</span> <span word="we">we</span> <span word="had">had</span> <span word="arrived">arrived</span> <span word="there">there</span> <span word="two">two</span> <span word="hours">hours</span> <span word="earlier">earlier</span>.(表示愿望虚拟)</p><p> <span word="D">D</span>、<span word="He">He</span> <span word="demanded">demanded</span> <span word="that">that</span> <span word="we">we</span> (<span word="should">should</span>)<span word="start">start</span> <span word="right">right</span> <span word="away">away</span>.(表示建议虚拟)</p><p> <span word="E">E</span>、<span word="It">It</span> <span word="is">is</span>(<span word="high">high</span>)<span word="time">time</span> <span word="that">that</span> <span word="we">we</span> <span word="left">left</span> (<span word="should">should</span> <span word="leave">leave</span>)<span word="now">now</span>.(特殊从句虚拟)</p><p> <span word="F">F</span>、<span word="I">I</span> <span word="would">would</span> <span word="rather">rather</span> <span word="you">you</span> <span word="gave">gave</span> <span word="me">me</span> <span word="the">the</span> <span word="book">book</span>.(同上)</p><p> <span word="G">G</span>、<span word="It">It</span> <span word="is">is</span> <span word="necessary">necessary</span> <span word="that">that</span> <span word="we">we</span> <span word="should">should</span> <span word="clean">clean</span> <span word="the">the</span> <span word="room">room</span> <span word="everyday">everyday</span>，(主语从句虚拟)</p>
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