1. 定語從句的概念
2. 定語從句的關係詞（關係代詞：who, whom, which, that, whose；關係副詞: when, where, why）
3. 關係詞的辨別：
4. 定語從句注意事項：
a. 用 that不用which的情況：
當先行詞是不定代詞：all, little, few, much, something, anything, everything, nothing, none, some 等時
He did everything that he could to help us.
當先行詞被all, every, no, some, any, little, much, the only, the very, the right, the last, just等修飾時
This is the only book the I want.
當先行詞有序數詞或最高級修飾時（或先行詞本身就是序數詞或形容詞最高級時）
That is the most expensive hotel that we have ever stayed in.
當先行詞既指人又指物時
The guests spoke highly of the children and their performances that they saw at the Children`s Palace.
當主語是以who 或 that開頭的特殊疑問句時
Who is the person that is standing at the gate?
b. 用which不用that的情況
關係代詞前有介詞且指物時
The pen with which you are writing is mine.
先行詞本身就是that時
What`s that which flashed in the sky just now.
c. 用who 不用that的情況
先行詞是指人的不定代詞， one，anyone，somebodym,those等時
Those who have good manners will be respected.
先行詞指人並含有較長的後置定語或在被分割的定語從句中時
The boy was crying hard who lost his way while looking for his mother.
5. 定語從句中的主謂一致
One of + 名詞複數
The ( only) one of + 名詞複數
The very/ right +名詞複數
