導語：非限制性定語從句是先定語從句有限制性和非限制性兩種。限制性定語從句是先行詞不可缺少的部分，去掉它主句意思往往不明確；行詞的附加說明，去掉了也不會影響主句的意思，它與主句之間通常用逗號分開，以下小編為大家介紹定語從句連線詞that文章，歡迎大家閱讀參考!
一、定語從句的有關概念：在複合句中，修飾某一名詞或代詞的從句叫做定語從句。
如：1)The man who/thatlives next to us is a policeman.
2)You must do everythingthatI do.
在上面兩句中的 man 和everything 是定語從句所修飾的詞，叫先行詞。定語從句放在先行詞後面。引導定語從句的關係詞有關係代詞：that, which ,who (賓格whom ,所有格whose )和關係副詞where, when .關係詞（關係代詞或關係副詞）放在先行詞和定語從句之間，起聯絡作用，同時又作定語從句的一個成分。
也就是說關係詞有兩個作用： 1.引導定語從句。 2.代替先行詞在其引導的定語從句中充當一定的句子成分。
二、有關係代詞引導的定語從句：關係代詞 例句That在從句中作主語或賓語(作賓語時that可省略) 指物 1.A plane is a machinethatcan fly. (作主語) noodles （that） I cooked were delicious. (作賓語) 指人 is the manthatis reading the book over there? (作主語) girl (that) we say yesterday was Jim’s sister. (作賓語) Which在從句中作主語或賓語(作賓語時可省略) 指物 silk which is produced in Hangzhou sells well. (作主語) songs （which） Liu Dehua sang were very popular. (作賓語) Who, whom在從句中分別作主語和賓語（如果介詞放在從句後面，則whom可以省略） 指人 foreiger who visited our class yesterday is from Canada. (作主語) boy who break the window is called Roy. (作主語) person to whom you just talked is Mr Li. (作賓語) White is the person to whom you should write. (作賓語) Whose 在從句中作定語 指人或物的所有格 I like the girl whose hair is long. (作定語) （從表中可以看出：用that更有通用性）三、有關係副詞引導的定語從句：(只作瞭解) 1. 先行詞是表示地點的名詞時（country, school, room…），而關係詞代替先行詞在定語從句中充當地點狀語，一般用where引導定語從句。也可以用介詞＋which的結構。值得注意的是which前介詞的選擇是根據先行詞與介詞的搭配關係而定。 The room where(=in which)he used to live has now been turned into a museum.. The desk where(=on which)I put my bag is his. This is the school where(=in which)I joined the Party. 2. 先行詞是表示時間的名詞（year,month,day,night…），而關係詞代替先行詞在定語從句中充當時間狀語，一般用when引導定語從句。也可以用介詞＋which的結構。值得注意的是which前介詞的選擇是根據先行詞與介詞的'搭配關係而定。 The day when（=on which）he was born was Aug.20,1952 The year when (=in which) he died was 1982..
四、定語從句分類(只要瞭解)定語從句分為：限制性定語從句和非限制性定語從句（又稱描述性定語從句）。
1、 限制性定語從句與先行詞關係密確，對它有限制作用，因些不可缺少，否則會影響全句的意思，限制性定語從句前面一般不用逗號。例What is the name of the boy who brought us the letter?
2、非限制性定語從句只與先行詞有一種鬆散的修飾關係，在口語中用停頓的方法表示，在書面語中用逗號分開，因此從句中的關係代詞不能省略。一般用which ,who,where等來引導非限制性定語從句，而不用that來引導非限制性定語從句。例①I like talk with John, who is a clever man. 例②Water,which is a clear liauid (液體)，has many uses.
五、關於that;which 用法請注意： ①先行詞之前有all, every, any, no ,little, much,few 等詞修飾時，或者其本身為all, everyone,everybody,everything, nobody,nothing,anything,anyone,anybody等不定代詞，代替物時，定語從句that用引導。 注：something後一般用which。 Is there anythingthatyou want to explain ? Everyonethatheard her sad story was moved to tears. In 1898 they declared（宣告）thatthey believed there was something in nature which gave out radiation.(輻射) ②先行詞前有形容詞最高階、序數詞或only,very,none,,the first,the last,the same表示“惟一”觀念的形容詞等修飾時，定語從句用that引導。That可指人，也可指物。 This is the only reasonthatI can say. This is the first stepthatcan be taken. It is the best onethatyou may choose. ③ 當主句中有who,which時，而定語從句中也要用到who或which時，為了避免who…who,which…which等重疊，定語從句用that引導。 Who is the manthatis standing by the door? Which of the two cowsthatyou keep produces more milk? ④先行詞為人和物作並列成分時，定語從句用that引導。 John and his dogthatwere here a moment ago disappear now. ⑤不論人或物在定語從句中作表語時，用that引導定語從句，而that通常省掉。 He is no longer the manthathe was. ⑥先行詞是一個短語或者是一個句子時，關係代詞用 which (大多數情況是非限制性定語從句) He missed the train ,which annoyed (使。。。惱火) him very much .
注意事項：
一般說來，除了用定語從句解釋名詞或泛指外，先行詞前應有定冠詞the。
2. 在限制性定語從句中which,whom,that充當賓語時，可以省略。而在非限制性定語從句中whom,who,which不能省略。
3. 在含有非限制性定語從句的複合句中從句與主句之間應該用逗號隔開。
4.“one of＋可數名詞複數”引導的定語從句中,謂語動詞應用複數；而“one of＋可數名詞複數”前有the，only或the only修飾，定語從句中的謂語動詞用單數。 He is one of the students who study very hard at school. He is the(only/the only) one of the students who studies very hard at school.
