在非限定性定語從句中，不能用that，而用who, whom代表人，用which代表事物。以下內容是小編為您精心整理的英語定語從句判斷，歡迎參考！
英語定語從句判斷一
非限定性定語從句：非限定性定語從句的作用是對所修飾的成分作進一步說明，通常和主句間用逗號隔開，將從句拿掉後其他部分仍可成立
1. which引導的非限定性定語從句來說明前面整個句子的情況或主句的某一部分
2. 在引導限定性定語從句時，that有時相當於in which, at which, for which或at which
Attitudes towards daydreaming are changing in much the same way that(in which) attitudes towards night dreaming have changed. 人們對白日做夢的態度正在改變，這與人們對夜間做夢的看法的變化有非常相似之處。
I like the music for the very reason that(for which) he dislike it. 我出於某種原因喜歡這種音樂，而他恰恰與我相反。
We arrived the day that(on which) they left. 剛好我們到的那天他們走了。
3. 有時as也可用作關係代詞
4. 在非限定性定語從句中，不能用that，而用who, whom代表人，用which代表事物
英語定語從句判斷二
1. 形式上，非限制性定語從句往往用逗號隔開。
2. 語法上，非限制性定語從句一般不用that.
3. 語義上，限制性定語從句與先行詞關係緊密，起限定作用，如果去掉了這個定語從句，整個句子就不完整或者會改變意思;而非限制性定語從句與先行詞關係不是很緊密，對先行詞起補充說明或描述的作用。
This is the book I like best. 這就是我最喜歡的`那本書。
Beijing, which has been Chinas capital for more than 800 years , is rich in cultural and historic relics. 北京是中國八百年之久的古都，它有著豐富的文化和歷史遺產。
4. 翻譯時，限制性定語從句可譯為一句(較短的一般譯為的字結構);而非限制性定語從句可譯為兩句。(見上句翻譯)
比較: He has a sister, who is a musician.
He has a sister who is a musician.
引導非限制性定語從句的關係代詞，指人時用who, whom, whose , 指物時用which , whose; 關係副詞when，where, why, etc.
1. He studied hard at school when he was young, which leads to his success in his later life.
2. Toms father, who arrived just now, is a famous scientist.
3. They set up a separate state of their own, where they would be free to keep Negroes as slaves.
