2. There is one thing that keeps worrying me.

(二)当先行词是表示时间，地点，原因的词时，关系词用when, where, why 还有which, that

1. The Titanic was the largest ship that had ever been built at that time.

2. Many people who saw the film were afraid to swim in the sea when they remembered the scenes in which people were eaten by the shark.

知识重点与难点

(一)当先行词有最高级，序数词修饰，是不定代词，或是all, no, only等形式时，关系代词一般用that，而不能用which。

1. There was a man with whom I would have to work together and finally the manager of the company.

4. Their talk includes rhythm and rhyming words as well as tongue twisters, which often make the audience applaud.

(三)关系词前面可以根据定语从句的内容加上一些介词，这些关系词在介词后面常用which 或whom.

3. Flora, whose beautiful hair and dress were all cold and wet, started crying.

2. Tree after tree went down, cut down by the water, which must have been three meters deep.

1. Before she could move, she heard a loud noise, which grew to a terrible roar.

6. Oprah Winfrey is a black woman whose rise to fame is an inspiring story.

(二)定语从句分为限定性定语从句和非限定性定语从句：

限定性定语从句：从句对先行词进行必要的描述或说明，缺少它，则句义显得不完整，从句与先行词紧密相连。

非限定性定语从句：对先行词进行补充说明，解释，它与先行词之间有逗号隔开。

5. Visitors can go on exciting rides where they can feel what it is like to do the things they have seen their heroes do in the movie.