概說：形容詞做定語和從句做定語。
　　在英文中我們可以用形容詞或其他詞類或非謂語動詞修飾一名詞，如I don’t like impatient guys. Over two million people suffered from the blackout in New York. Those under 17 are not allowed to see the movie. Do you the number of foreign guests coming to the surprise party? 但是要表達更為復雜的意思，簡單用形容詞無法搞定，我們要用一個句子才行，這種句子來修飾名詞，做定語。
　　一、定語從句中的基本概念。
　　1)定語從句：修飾名詞或代詞的從句叫定語從句。
　　2)先行詞：位置在定語從句前，被定語從句修飾或限制的對象叫先行詞。現在我們來全面理解先行詞：
　　① 先行詞可以不只是一個詞。盡管我們他這個對象稱為先行詞，但它不一定就是一個詞，它可以是：
　　A.一個詞
　　The woman who lives next door is a famous singer.
　　He who hesitates is lost.
　　B.短語
　　He likes climbing mountains, which is a good exercise.
　　C.一個分句
　　He said that he had no time, which is not true.
　　D.一個完整句子
　　He arrived an hour later, which annoyed his girlfriend very much.
　　My girlfriend likes chatting online with other guys, which really drives me crazy.
　　3) 關系詞：引導定語從句的詞叫關系詞。關系詞有關系代詞和關系副詞。關系代詞有that, which, who, whom, whose, as等;關系副詞有when, where, why等。其作用有二：A.代詞作用:重復代替先行詞并在從句中充當一定成分;B.連接作用:起連接主句和從句的作用. 八戒的“我愛你”搞定定語從句
　　二、關系代詞引導的定語從句
　　用豬八戒跟高老莊的高翠翠愛情故事來講解定語從句
　　1.who 指人，在定語從句中作主語。
　　I love you.
　　I who is a quite fat guy love you.
　　2.whom 指人，在定語從句中做賓語，常可省略
　　I love you whom I have known since I came to Gao Laozhuang.
　　3.Whose 通常指人，也可指物，在定語從句中做定語。
　　I whose heart is full of enormous tenderness love you.
　　4.Which 指物，在定語從句中做主語或賓語，做賓語時常可省略。
　　My heart which belongs to you is missing you.
　　I will send you my rake(釘耙) which you must like.
　　5.That 指人時，相當于who 或whom;指物時，相當于which.。在定語從句中作主語或賓語，作賓語時常可省略。
　　替換which
　　My heart which belongs to you is missing you.
　　I will send you my rake(釘耙) which you must like.
　　三、關系副詞
　　1. when 指時間，在定語從句中作時間狀語。其先行詞一般是表示時間的名詞
　　Since the first day when I saw you, I have been in love with you.
　　2. where 指地點，在定語從句中作地點狀語。其先行詞一般是表示地點的名詞，有時可以是有地點意義的抽象名詞。
　　I began to love you in Gao Laozhuang where I met you the first time.
　　3. why 指原因，在定語從句中作原因狀語。其先行詞一般是表示原因的名詞
　　The reason why I am reluctant to leave is that I love you.
　　作業：在需要的地方填上who, which, that, when, where, why 或whose(缺不缺，看先行詞)
　　1.The only games _____i play are football and tennis.
　　2.He is the only student _____understands English well.
　　3.Is this the money_____ you lost?
　　4.That is the horse_____ won the race.
　　5.He is the sort of person______ everyone admires.
　　6.He is a writer_____ books are interesting.
　　7.I still remember the years_____ i spent in Beijing.
　　I still remember the years____ I lived in Beijing.