复习名词性从句作主、宾、表
编稿：牛新阁 审稿：王春霞
概念引入
名词性从句包括主语从句、表语从句、宾语从句和同位语从句，其功能相当于名词。综观近几年的高考英语试题，名词性从句是必考项之一。在本单元中，我们将对名词性从句的考点一一剖析。
先看下面句子：
1. That is why today over 40% of Californians speak Spanish as a first or second language.
2. It is believed that before long the mix of nationalities will be so great that there will be no distinct major racial or cultural groups, but simply a mixture of many races and cultures.
3. Scientists believe that these settlers crossed the Bering Str ait in the Arctic to America by means of a land bridge which existed in prehistoric times.
4. The fact that they arrived a long time before Europeans is what matters.
这些句子中斜体词部分都是名词性从句，句1是why引导的表语从句；句2是that引导的后置的主语从句；句3是that引导的宾语从句，而句4是that引导的同位语从句，而is后是what引导的表语从句。本单元我们将复习名词性从句中的主语从句、宾语从句和表语从句，而同位语从句的用法将在下一单元复习。
