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定语从句是中学英语语法中的重点内容，也是高考中常考查的一个考点。掌握定语从句的用法，必须突破以下六道难关：

一、选准关系代词和关系副词

在定语从句中，关系代词或关系副词都代替先行词在从句中充当一定的成分，如果该从句中缺少主语、表语、宾语或定语，就要用关系代词来连接从句；如果从句中缺少状语，就得用关系副词来连接从句。例如：

(1)I still remember the days which / that we spent together.

(2)I still remember the days when we worked together.

二、了解仅用that 引导限制性定语从句的几种情况

that 在限制性定语从句中既可指人又可指事或物。在下列情况下，只能用that 来引导定语从句：

1. 先行词是all , much, few, little, everything, anything, nothing 等不定代词时。例如：

Is there anything that you want to buy?

2. 先行词被all, few, little, much, every, some, no等词修饰或被the only, the very, the   same, the last 等限定词修饰时。例如：

These are all the pictures that I have seen.

This is the very dictionary that is of great help.