大学英语四六级考试必备语法从句(2)
<p> 大学英语四六级考试必备语法：从句</p><p> 7.非限制性定语从句</p><p> 非限制性定语从句修饰先行词或整个主句，起补充说明的作用，如果省略掉，原句句意仍保持完整。非限制性定语从句要用逗号与主句隔开，其引导词不能用<span word="that">that</span>。非限制性定语从句属于正式语体。经常考到的非限制性定语从句有以下三种。</p><p> 1) 由<span word="which">which</span>、<span word="as">as</span>引导的非限制性定语从句。<span word="which">which</span>、<span word="as">as</span>代表整个主句。</p><p> <span word="He">He</span> <span word="said">said</span> <span word="that">that</span> <span word="he">he</span> <span word="had">had</span> <span word="never">never</span> <span word="seen">seen</span> <span word="her">her</span> <span word="before">before</span>, <span word="which">which</span> <span word="was">was</span> <span word="not">not</span> <span word="true">true</span>.</p><p> <span word="China">China</span> <span word="is">is</span> <span word="still">still</span> <span word="a">a</span> <span word="developing">developing</span> <span word="country">country</span>, <span word="which">which</span> <span word="is">is</span> <span word="known">known</span> <span word="to">to</span> <span word="all">all</span> <span word="of">of</span> <span word="us">us</span>.</p><p> 2) 由 介词+关系代词引导的非限制性定语从句。</p><p> <span word="He">He</span> <span word="sent">sent</span> <span word="her">her</span> <span word="a">a</span> <span word="letter">letter</span>, <span word="in">in</span> <span word="which">which</span> <span word="he">he</span> <span word="said">said</span> <span word="that">that</span> <span word="he">he</span> <span word="was">was</span> <span word="sorry">sorry</span> <span word="for">for</span> <span word="what">what</span> <span word="he">he</span> <span word="had">had</span> <span word="done">done</span> <span word="to">to</span> <span word="her">her</span>.</p><p> <span word="He">He</span> <span word="failed">failed</span> <span word="to">to</span> <span word="pass">pass</span> <span word="the">the</span> <span word="exam">exam</span>, <span word="because">because</span> <span word="of">of</span> <span word="which">which</span> <span word="his">his</span> <span word="parents">parents</span> <span word="scolded">scolded</span> <span word="him">him</span>.</p><p> 4) 由 数词、代词或名词+<span word="of">of</span> +关系代词引导的非限制性定语从句。</p><p> <span word="He">He</span> <span word="had">had</span> <span word="three">three</span> <span word="sons">sons</span>, <span word="one">one</span> <span word="of">of</span> <span word="whom">whom</span> <span word="was">was</span> <span word="my">my</span> <span word="sons">sons</span> <span word="classmate">classmate</span>.</p><p> <span word="There">There</span> <span word="are">are</span> <span word="about">about</span> <span word="twenty">twenty</span> <span word="students">students</span> <span word="in">in</span> <span word="this">this</span> <span word="course">course</span>, <span word="most">most</span> <span word="of">of</span> <span word="whom">whom</span> <span word="are">are</span> <span word="freshmen">freshmen</span>.</p><p> <span word="They">They</span> <span word="are">are</span> <span word="two">two</span> <span word="different">different</span> <span word="words">words</span>, <span word="the">the</span> <span word="spellings">spellings</span> <span word="of">of</span> <span word="which">which</span> <span word="are">are</span> <span word="easily">easily</span> <span word="confused">confused</span>.</p><p> Ⅱ 状语从句</p><p> 1. 状语从句中以下四种从句考得较多，这里给予简单介绍。</p>
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