雅思官方對于寫作的評判遵循global scoring的原則，如何提高句子的表現力，使考官能夠impressive,來提升自己的寫作level當屬學生最感困惑之處，往往加倍的努力并不一定收效顯著，還會在具體寫作時捉襟見肘，錯誤疊出，這大部分是由于平時積累欠缺，對西方寫作風格掌握不夠的緣故。針對大部分考生備考時間短的現實，分析認為，除了加強練習不同的寫作話題，積累觀點，儲備功能性套句以外，若能從定語從句的角度具體細致地進行練習，也不失為良策。因為它具備如下特點：

一、簡單易操作

定語從句是中學語法內容中的重要部分之一，大部分同學只是對其用法模糊而已，不夠細致和確定而已，不存在對根本概念的輸入難度。但正因為如此，也使得考生容易掉以輕心，此時教師應充分強調其重要性。

由于大部分學生手中都有現有的語法書，只需要提醒學生關注相應定語從句的章節(jié)即可，簡單易行。筆者以下列‘常用that 不用which ’的用法舉例，歸納為11點，方便學生在練習時查對。

1.當先行詞為all, little, much, few, everything, none 等不定代詞時關系代詞用that而不用which.

I will tell him all that you told me at the ball.

There are few books that you can read in this book store.

2.當先行詞既有人又有物時,關系代詞用that, 不用which.

He asked about the factories and workers that he had visited.

3.當先行詞有形容詞最高級修飾時,關系代詞用that, 而不用which.

This is the best novel that I have ever read.

Guilin is one of the most beautiful cities that I have ever visited.

4.當先行詞有序數詞修飾時,關系代詞用that, 不用which.

The first sight that was caught at the Great Wall has made a lasting impression on him.

5.當先行詞被the only, the very, the same, the right等修飾時,關系代詞用that,不用which.

That is the very thing that we can do.

It is the only book that he bought himself.

6.當先行詞被all, every, any, much, little, few, no等修飾時,關系代詞用that,不用which.