表语从句中的注意事项及系动词分类
<p>1. 当主语为<span word="reason">reason</span> 时，表语从句的连接词要用<span word="that">that</span>，不用<span word="because">because</span>，构成句型“<span word="the">the</span> <span word="reason">reason</span> (<span word="why">why</span>…) <span word="is">is</span> <span word="that">that</span>….”</p><p><span word="The">The</span> <span word="reason">reason</span> <span word="why">why</span> <span word="you">you</span> <span word="did">did</span> <span word="not">not</span> <span word="join">join</span> <span word="us">us</span> <span word="seems">seems</span> <span word="unbelievable">unbelievable</span>.</p><p>2. <span word="A">A</span> <span word="is">is</span> <span word="to">to</span> <span word="B">B</span> <span word="what">what</span> <span word="C">C</span> <span word="is">is</span> <span word="to">to</span> <span word="D">D</span>.</p><p><span word="English">English</span> <span word="is">is</span> <span word="to">to</span> <span word="me">me</span> <span word="what">what</span> <span word="fish">fish</span> <span word="is">is</span> <span word="to">to</span> <span word="water">water</span>.</p><p>3.在一些表示“建议、劝说、命令”的名词后面的表语从句中，谓语动词用虚拟语气。<span word="should">should</span>+动词原形表示，<span word="should">should</span>可省略。如：</p><p><span word="My">My</span> <span word="suggestion">suggestion</span> <span word="is">is</span> <span word="that">that</span> <span word="we">we</span> (<span word="should">should</span>) <span word="start">start</span> <span word="early">early</span> <span word="tomorrow">tomorrow</span>. 我的建议是我们明天一早就出发</p><p>4.系动词分类：</p><p>一、根据系动词后所跟结构，我们可以把英语系动词分为两大类：</p><p>完全系动词(其后只能跟表语的动词，如<span word="be">be</span>, <span word="seem">seem</span>)和半系动词(其后既可跟表语作系动词用法，也可跟宾语或状语作实义动词用，如<span word="look">look</span>)</p><p>例如：</p><p>1)<span word="He">He</span> <span word="looked">looked</span> <span word="sadly">sadly</span> <span word="at">at</span> <span word="the">the</span> <span word="boy">boy</span>.(“看着”，实义动词用法)</p><p><span word="He">He</span> <span word="looks">looks</span> <span word="a">a</span> <span word="clever">clever</span> <span word="boy">boy</span> .(“看起来”，系动词用法)</p><p>2)<span word="He">He</span> <span word="looks">looks</span> <span word="at">at</span> <span word="a">a</span> <span word="clever">clever</span> <span word="boy">boy</span>.(“看着”，实义动词用法)</p><p>在英语中，某一动词是多义词，既有实义动词用法，又有系动词用法。</p><p>二、根据系动词的意义，我们把英语系动词分为四类：</p><p><span word="A">A</span>.五大感官系动词 <span word="B">B</span>.状态系动词 <span word="C">C</span>.动态系动词 <span word="D">D</span>.双谓语系动词</p>
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