[分析]

a. 本句是一个主从复合句, 也是个倒装句。

b. 主句是 __________________, 从句是when引导的宾语从句。

no one really knows

c. 在宾语从句中, what引导的从句作介词in的宾语。

[考点]

exactly精确地，恰好，完全。可构成not exactly，表示"一点也不，不完全是"。

2. However, it is likely that Native Americans were living in California at least fifteen thousand years ago.

[考点] 此句中的it是形式主语, 真正的主语是后面的that从句。另外, what, how, where, who等也常用作主语从句的引导词。

3. That is why today over 40% of Californians speak Spanish as a first or second language.

[考点]

why在此引导表语从句。表语从句也可由what, where, when等引导。

4. Although Chinese immigrants began to arrive during the Gold Rush Period, it was the building of the rail network from the west to the east coast that brought even larger numbers to California in the 1860s.

虽然中国移民在淘金热时期就开始到来了, 但是更大批量的中国移民却是在

19世纪60年代为修建贯穿美国东西海岸的铁路而来的。

[点拨]

此句为主从复合句, 从句为although引导的让步状语从句, 主句为 it was ... that强调句, 用来强调主语the building of ...。如：

It was being invited to the party that was a great honor to the family.

被邀请参加聚会是这家人的荣幸。

强调句: It is (was) 被强调部分+that (who) + 句子其他部分。此结构强调的成分仅限于主语, 宾语和状语。

原句：My father did the experiment in the lab yesterday evening.

强调主语：

It was my father who did the experiment in the lab yesterday evening.

强调宾语：

It was the experiment that my father did in the lab yesterday evening.

强调时间：

It was yesterday evening that my father did the experiment in the lab.

(注意不用when)

强调地点：

It was in the lab that my father did the experiment yesterday evening.

5. In more recent decades, California has become home to more people from Asia, including Koreans, Cambodians, Vietnamese and Laotians.

最近几十年, 加利福尼亚成了更多亚洲人的家, 其中包括韩国人、柬埔寨人、越南人和老挝人。

这是一个简单句。句中有in the past few years, in recent years等时间状语时, 句子的谓语动词通常用现在完成时，如: In the past ten years, great changes have taken place in my hometown. 另外, including是介词, 意为"包括 (于......之中)"。

Step III Exercises