高考英语必背句型：特殊疑问句

　　It强调句型
　　强调句的基本构成：It is/was + 被强调的部分 + who(主要指人时)/that + 其余部分
　　[注意1]
　　这种结构可以强调句子的主语、宾语、状语(包括时间，地点，方式，原因等)，但是不能强调谓语动词(参考句型15)。
　　原句的谓语动词如果是现在或将来时态，用It is…that/who….;
　　原句的谓语动词如果是过去时态，用It was…that/who….;
　　强调时间、地点、原因或方式时不要用when, where或how, 必须用that。
　　[例句1]
　　I saw him in the street yesterday afternoon.
　　→It was I who saw him in the street yesterday afternoon.(强调主语)
　　→It was in the street that I saw him yesterday afternoon.(强调地点状语)
　　→It was yesterday afternoon that I saw him in the street.(强调时间状语)
　　→It was him that/who I saw in the street yesterday afternoon.(强调宾语)
　　[例句2]
　　He didn’t go to bed until his mother came back.
　　→It was not until his mother came back that he went to bed.
　　He didn’t do his homework until his father came back from work.
　　→It wasn’t until his father came back from work that he did his homework.
　　[例句3]
　　Only when you nearly lose someone do you fully realize how much you value him.
　　→It is only when you nearly lose someone that you fully realize how much you value him.
　　只有你快要失去某个人时，你才意识到你是多么尊重他。
　　[例句4]
　　I was late again because the traffic was very heavy during the rush hour.
　　→It was because the traffic was very heavy during the rush hour that I was late again.
　　(强调句中只能强调由because引导的原因状语从句，because不能换成since, as, for, now that等)
　　[注意2]强调句的疑问结构
　　一般疑问句 Is / Was it +被强调部分 +who / that …?
　　特殊疑问句 特殊疑问词+is /was +it +who / that…?
　　What is/was it that…? Who is/was it that…? When is/was it that…?
　　Where is/was it that…? Why is/was it that…? How is/was it that…?
　　[例句1]
　　I saw him in the street yesterday afternoon.
　　→When was it that you saw him in the street?
　　→Who was it that you saw in the street yesterday afternoon?
　　→Where was it that you saw him yesterday afternoon?
　　[例句2]
　　I don’t know when he will come back.
　　→I don’t know when it is that he will come back.(宾语从句疑问词后用陈述句语序)
　　–How was it that you got in touch with Mr. Smith? 你是怎么和Smith先生联系上的?
　　–Trough a friend of mine. 通过一个朋友。