语 境 自 主 领 悟
先观察原句
后自主感悟
①Exactly when the first people arrived in what we now know as California，no one really knows.
②However，it is likely that Native Americans were living in California at least fifteen thousand years ago.
③Scientists believe that these settlers crossed the Bering Strait in the Arctic to America by means of a land bridge which existed in prehistoric times.
④That is why today over 40% of Californians speak Spanish as a first or second language.
⑤It 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.
1.以上各句皆为主从复合句，句中用了相当于名词作用的从句(即名词性从句)在句中充当成分。
2.名词性从句在句中可作介词的宾语(句①)，动词的宾语(句③)。
3.名词性从句在句中可作主语，且可用it作形式主语，真正的主语从句置于句末(句②、⑤)。
4.名词性从句在句中可作表语(句④)。
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