2015年职称英语考试理工类语法词汇复习(3)
<p> 条件状语从句：分真实条件句和非真实条件句</p><p> 重点：在条件状语中，用一般时代替将来时</p><p> 虚拟语气</p><p> 主要连接词：</p><p> <span word="if">if</span> / <span word="unless">unless</span></p><p> 例如：</p><p> <span word="Children">Children</span> <span word="should">should</span> <span word="not">not</span> <span word="be">be</span> <span word="taken">taken</span> <span word="into">into</span> <span word="the">the</span> <span word="room">room</span> <span word="of">of</span> <span word="a">a</span> <span word="very">very</span> <span word="sick">sick</span> <span word="person">person</span> ______ <span word="there">there</span> <span word="is">is</span> <span word="some">some</span> <span word="special">special</span> <span word="reason">reason</span> <span word="for">for</span> <span word="it">it</span>.</p><p> <span word="A">A</span>.<span word="except">except</span> <span word="B">B</span>. <span word="besides">besides</span> <span word="C">C</span>. <span word="unlessD">unlessD</span>.<span word="whereas">whereas</span></p><p> 解题思路：根据上面说过的连接原则，这里必须是一个连接词，而<span word="A">A</span>，<span word="B">B</span>都是介词，因此正确答案只能在<span word="C">C</span>，<span word="D">D</span>中选。<span word="whereas">whereas</span>意为而，故正确答案为<span word="C">C</span>.</p><p> <span word="provided">provided</span> / <span word="on">on</span> <span word="condition">condition</span> <span word="that">that</span> 知道这也是连接词就可以了，一般说，当考题中出现这种词时，应倾向选择。</p><p> 3) 原因状语从句：</p><p> 主要连接词：<span word="because">because</span>/ <span word="since">since</span> / <span word="as">as</span></p><p> 要点：不要把连接词 <span word="because">because</span>与介词短语<span word="because">because</span> <span word="of">of</span> 相混淆;</p><p> 不要把表示原因的<span word="since">since</span>与表示时间的<span word="since">since</span>自从相混淆;</p><p> 不要把表示原因的<span word="as">as</span>与表示时间的<span word="as">as</span>随着相混淆;</p><p> 顺便提一下， <span word="because">because</span>表示直接因果关系，而<span word="since">since</span>, <span word="as">as</span> 是对事实的说明，主句和从句之间并不一定具有因果关系.</p><p> </p>
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