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定语从句是中学英语教学中的一个重要语法项目，也是教师资格考试中考查学生的专业知识与能力的体现。根据这一知识点在中学英语教学中的实际地位，现将定语从句易出错的地方归纳为以下几点，希望对大家有所帮助。
易错点一：关系代词和关系副词的混用
例 1. I’ll never forget the days when I spent in New York with you.
例 2. I’ll never forget the days which I visited New York with you.
析：例 1 中的 when 应改为 which 或 that ;例 2 中的 which 应改为 when .
区分关系代词和关系副词的关键是看它们在定语从句中所充当的成分。如果定语从句中缺少主语、宾语，就应考虑使用关系代词，如例 1 ;若定语从句中缺少状语，就应考虑使用关系副词，如例 2 .
【考场思维训练】
1.After living in Paris for 50 years he returned to the small town _____ he grew up as a child.
A. which B. where C. that D. when
【答案】B。解析：定语从句缺地点状语。
2. I never forget the days _____ we spent together.
A. that B. when C. whose D. what
【答案】A。解析：that在定语从句中作"spent” 的宾语。
3. Have you seen the film" Titanic", ______ leading actor is world famous?
A. its B. it' s C. whose D. which
【答案】C。解析：whose作定语从句中主语的定语。
易错点二：固定句式出差错 (关系代词as的用法)
例 3. Mary is so lovely a girl as everybody loves her.
例 4. Mary is so lovely a girl that everybody loves.
析：例 3 中的 as 应改为 that ; 例 4 中的 that 应改为 as .
so…as 或 so…that 为固定句式，前者为 as 引导的定语从句， as 在定语从句中作宾语或主语，如例 4 ;后者为 that 引导的结果状语从句，该从句的成分是完整的，不缺少主语或宾语，如例 3 .类似的固定句式还有 the same… as (that) , such…as , as…as 等。
【考场思维训练】
1、The word "write" has the same pronunciation ____ the word "right"
A. of B. as C. to D. from
【答案】B。解析：as引导的限制性定语从句既可指人又可指物，它只能替代由such，the same等修饰的先行词，故选B。
2、We have found such materials ____ are used in their factory.
A. what B. that C. how D. as
【答案】D。解析：such+名词+as…“像……一样的;像……之类” the same+名词+as.. “和……同样的”，其中关系代词as在从句中可担当主语、宾语或表语。该句中作主语，故选D。
3、This book is very interesting. Where did you buy it? I will buy the same book you have bought.
A. which B. as C. that D. what
【答案】B。解析：the same…as...
4. Last term our math’s teacher set so difficult an examination
problem ____ none of us worked out.
A. that B. as C. so that D. which
【答案】B。解析：此题易误选为A，选A是把as引导的定语从句与“so / such…that…”结果状语从句弄混淆了。so 修饰先行词时用as引导定语从句且as刚好能作“worked out”这一及物性动词短语的宾语，故as正确;而选A则只能为“如此……以至于……”的结果状语从句，此时that不在从句中做成分，故此时 worked out 缺少宾语，因而选that错误。
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