顧名思義，定語從句就是充當定語,，用來修飾名詞或代詞的句子。被修飾的名詞或代詞稱作先行同,，在先行同和定語從句之間通常會有關系代詞或關系副詞，也即定語從句的引導詞,。常見的關系代詞有that, which, who, whom, whose,，關系副詞有why, when,where。相比其他引導詞引起的從句,，由that, which, who和why引導的定語從句在雅思寫作中使用的頻率較高,。
　　由who引導的定語從句 　　who引導的定語從句可以在句子中修飾表示人的名詞或代詞。此外,，如果who在定語從句中充當主語,，則它不能省略。
　　It offers many conveniences to the people who live there. 　　它給居住在那里的人們提供了很多便利,。
　　Compared with those who are introverted, with little words and easy to be comedepressed, I prefer to make friends with people who would like to share happiness and sorrow with me. 　　相比那些內向,、少言寡語且容易變得消沉的人，我更喜歡和愿意與我分享快樂和悲傷的人交朋友,。 　　They are backed up by technicians who design instruments to collect data from athletes. 　　他們背后有技師的支持,，這些技師設計工具以從運動員那里收集數(shù)據(jù)。
　　由why引導的定語從句 　　why引導的定語從句常用來修飾先行詞reason,，why在定語從句中充當原因狀語,。 　
　One reason why I support the building of a modern gym is that physical education class is very important to the well一being of students. 　　我支持興建一座現(xiàn)代化體育館的理由是，體育課學生們的健康非常重要,。
　　The main reason why I choose the pig is that, in my opinion, the country's most valued animal does not need to be graceful or cuddly, but rather beneficial to the average person. 　　對我而言,，我選擇豬的主要理由是，我國有價值的動物不需要很優(yōu)雅或者很可愛,，而應該是對每個人都有用處,。
　　The reason why I chose the forests as the most important is because they help us in so many ways. By saving the forests, I believe we can also save the planet. 　　我認為森林為重要，因為森林在很多方面都對我們有益,。通過拯救森林,，我相信我們也能夠拯救地球。

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