线话语法讲堂：it引导的强调句

　
 
常考的强调句构造是it 引导的句子。
It is (was) 被强调部分+ that (who) + 句子其余部分。

此结构强调的成分仅限于主语，宾语跟状语。
It is from the sun that we get light and heat.
It was not until I had read your letter that I understood the true state of affairs.

典型例题
1） It was last night ___ I see the comet.
A.　the time　B.　when　 C.　that　　D.　which
谜底C. 强调句的结构是： It +be +强调局部 + that (who) + 主谓句。　
强调句的连词只有两个，that跟who。当强调的部门是人，且为句子的主语时，才用 "who"，其余用that。

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. CopyRight .com
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. (留心不用when)
强调地点： It was in the lab that my father did the experiment yesterday evening.

2）It is ten years ___ Miss Green returned to Canada.
Athat　B. when　 C. since　 D. as
答案C. 考点是连词用法。 本题易误选为A. that. 切实本句不是强调句。若是，去掉It　 be… that还应是一个完整的句子。而本句去掉 'It is…that'，只剩下ten years Miss Green returned to Canada. 不成句。因此本句不是强调句。
It is /was +时光+ since…　其中is<---> has been　 was <---> had been.

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