1. She used to help my brother, who was very kind of her.
改：将 who改为 which。
析：犯这类错误的主要原因是把 my brother错当成了先行词。关系代词 which指代的先行词是整个主句，它引导非限定性定语从句。
2. Do you still remember the day when we spent together in China last year？
改：将 when改为 that/ which或将 when删除。
析：犯这类错误的主要原因是没有弄清关系代词与关系副词的用法区别。不能因为先行词表示时间就一定用关系副词 when，而要学会准确把握句子的结构，正确分析句子的成分。例句中定语从句要用关系代词引导，并在定语从句中作 spent的宾语。
3. The way which you look at problems is wrong.
改：在 which前加 in或者将 which改为 that，也可将 which删除。
析：当先行词是 the way时，定语从句常用 that/ in which引导， that/ in which也可省略。
4. We were interested in the things and people whom we saw during the trip.
改：将 whom改为 that。
析：当先行词既有人又有物时，定语从句用关系代词 that引导， that作宾语时可省略。
5. It was in the kitchen where the fire broke out.
改：将 where改为 that。
析：犯这类错误的主要原因是把强调句型与定语从句混为一谈了。例句为强调句型，强调的是地点状语 in the kitchen。
6. Is this factory that you have been working in since your graduation?
改：在 that前加 the one。
析：犯这类错误的原因是把 this factory错看作是定语从句的先行词了。解答这类题时，我们不妨先将疑问语序改为陈述语序。 this factory是主句的主语，故应添加 the one作定语从句的先行词。当然，在 factory前加 the也可以，那么 this是主语， the factory是表语。
7. He is such a lazy man as no one wants to work with him.
改：将 him删除或将 as改为 that。
析：犯这类错误的主要原因是把 such。 as。和 such。 that。两个句型混淆了。
8. There are many books in the library, most of which is in Chinese.
改：将 is改为 are。
析：关系代词作主语时，定语从句中谓语动词要与先行词在人称和数上保持一致。例句中关系代词 which指代的是先行词 books，故从句谓语动词应用复数形式。
9. I am terribly sorry for having broken the MP 4 I borrowed it from you the other day.
改：去掉 it。
析：定语从句中的关系代词在从句中充当一定的成分，因此从句中不能再出现与关系代词指代相同的代词或名词，以避免重复。例句中 it与省略了的关系代词 that/ which重复，应去掉。
