高一定語從句語法是怎樣的？以下是小編整理的相關語法，歡迎閱讀。
一、定語從句的概念
在複合句中，修飾某一名詞或代詞的從句叫定語從句。被修飾的名詞或代詞叫先行詞，引導定語從句的詞叫關係詞，定語從句一般放在先行詞的後面。
二、引導定語從句的關係詞
引導定語從句的.關係詞有關係代詞和關係副詞，常見的關係代詞包括that， which， who（賓格whom，所有格whose）等，關係副詞包括where， when， why等。關係代詞和關係副詞放在先行詞及定語從句之間起連接作用，同時又作定語從句的重要成分。
三、定語從句的分類
根據定語從句與先行詞的關係，定語從句可分爲限制性定語從句及非限制性定語從句。限制性定語從句緊跟先行詞，主句與從句不用逗號分開，從句不可省去。非限制性定語從句與主句之間有逗號分開，起補充說明作用，如省去，意思仍完整。
四、關係代詞的用法
1. that 既可以用於指人，也可以用於指物。在從句中作主語、賓語或表語。作主語時不可省略，作賓語可省略。例如：
Mary likes music that is quiet and gentle.
瑪麗喜歡輕柔的音樂。（that作主語）
The coat （that） I put on the desk is blue.
我放在桌子上的那件外套是藍色的。（that作賓語）
h用於指物，在句中作主語、賓語或表語。作主語不可省略，作賓語可省略。例如：
The building which stands near the train station is a supermarket.
位於火車站附近的那座大樓是一家超市。（作主語）
The film （which） we saw last night was wonderful.
我們昨天晚上看的那部電影很好看。（作賓語）
， whom用於指人，who 用作主語，whom用作賓語。在口語中，有時可用who代替whom。who和whom作賓語時也可省略。例如：
The girl who often helps me with my English is from England.
Who is the teacher （whom） Li Ming is talking to？
正在與李明談話的老師是誰？（作賓語）
五、模擬試題
1. Susan is the very girl _____ the good deed.
A. whom I think didB. whom I think she did
C. who I think didD. I think who did
2. Luckily, the poor boy had enough money _____ he could buy a train ticket.
A. by whichB. on whichC. with whichD. for which
3. The book _____ he devoted much time is to come out next month.
A. whereB. whichC. to whichD. on which
4. The day came finally _____ I was given an opportunity to act in the play.
A. whenB. in that C. whichD. in which
5. 1. Dont you think the question _____ tomorrow is of great importance.
A. being discussedB. discussed
C. to be discussedD. to discuss
6. The food _____ at the moment is for the dinner party.
A. cookedB. to be cooked C. is being cookedD. being cooked
7. Do you know the teacher _____ under the big tree ?
A. readB. readsC. readingD. being read
