英语专八强调结构语法精讲
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常考的强调句结构是it 引导的句子。
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。
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
答案C. 强调句的结构是： It +be +强调部分 + that (who) + 主谓句。 强调句的连词只有两个，that和who。当强调的部分是人，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.
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.
2)It is ten years ___ Miss Green returned to Canada.
A. that B. when C. since D. as
答案C. 考点是连词用法。 本题易误选为A. that. 其实本句不是强调句。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 +时间+ since… 其中is<---> has been was <---> had been.
结构分析
强调结构中的it is (was)…that (who)…为使一个非强调句变成强调句的结构词，在通常情况下，去掉它，句子依然是成立的——这是判断一个句子是否为强调结构的重要标志。如下面这个句子是强调句，因为去掉it was…that…后句子依然成立，且意思一致：
It was my mother who finally called the police. 最终报警的是我母亲。
→My mother finally called the police. 最终报警的是我母亲。
请看下面一句，空白处是填that还是其他的什么词?
It was ten o'clock _______ he returned home.
此处不能填that，因为若填that把它视为强调句，那么就可以去掉it was…that…而使句子结构完整，意思不变，事实上并非如此，因为我们是不能说Ten o'clock he returned home的，除非改为At ten o'clock he returned home才是正确的。
比较下面两句(第1句不是强调句，但第2句是强调句)：
It was ten o'clock when he returned home. 他回家的时候已是10点钟了。
It was at ten o'clock that he returned home. 他是10点钟回家的。
二、时态一致问题
一般说来，强调结构it be…that…中的be的时态应与句子时态一致，即同时用现在时，或同时用过去时，有时也可能用将来时。如：
It is not I who am angry. 发怒的不是我。(同时用现在时)
It was my two sisters who knew her best. 是我的两个姐妹最了解她。(同时用过去时)
It will not be you who will have to take the blame for this. 对此须受责难的将不是你。(同时用将来时)
但有时也可以不一致，这主要见于强调结构用it is…that…(即用的是现在时)，而句子用的是过去时。如：
It is Miss Williams who enjoyed reading novels as a pastime. 是威廉姆斯小姐以读小说来消遣。
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