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1、强调句的构成:
It is/was +被强调的成分+ that +其它成分
2、关于“被强调成分”
⑴“被强调的成分”最常见的是句子的主语、宾语、状语，特殊情况下也可能是宾语补足语、表语等成分 。如：
My father met with an old friend of his [in the street] [yesterday].
→ It was my father that/who met with an old friend of his in the street yesterday.（主语）
→ It was an old friend of his (that/whom) my father met with in the street yesterday.（宾语）
→ It was in the street that my father met with an old friend of his yesterday.（地点状语）
→ It was yesterday that my father met with an old friend of his in the street.（时间状语）

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⑵“被强调的成分”通常不能是表语、谓语动词、though/although引导的让步状语从句或whereas引导的从属分句等 。但是，如果当系动词不是be,且表语部分是名词性词组时，强调句也可以强调表语 。如：
①The picture is wonderful.
→It is wonderful that the picture is. (×)
②He becomes head of the department now.
→It is head of the department that he becomes now. (√)
⑶“被强调的成分”是原因状语从句时，只能强调由because引导，而不能强调由since/as/why 等引导的原因状语从句 。
It was because the water had risen that they could not cross the river. (√)
It was since they’ve obviously forgotten to phone me that I’ll have to phone them. (×)
⑷如果强调动作，“被强调的成分”也可以是动词的非谓语形式 。如：It was meeting Peter that really started me off on this new line of work.
⑸ “被强调的成分”也可以是宾语补足语 。
It is green that they painted the wall.
3、强调句中that的用法
⑴“被强调的成分”不论是时间状语还是地点状语，只能用that，而不能用when, where 。
It was in Berlin that I first saw this film.
It was then that I recalled that I had left my wristwatch up in the bar.
⑵ “被强调的成分”如果是表示人的名词作主语或宾语时，常用who或whom代替that 。
It was my father who met with an old friend of his in the street yesterday.
⑶“被强调的句子成分”如果是时间状语、地点状语、直接宾语或间接宾语时，that可省略 。
It was in that bookstore (that) I came across that book.
It was a new dictionary (that) Father sent to me.
It was only yesterday (that) we first met.
It is not I (who) to blame.
4、强调句中的主谓一致
“被强调的成分”如果是人称代词作主语时，通常用主格代词，但在口语中也常常使用宾格形式，但要注意人称和数的一致 。试比较：
I suppose it is I who am responsible.
I suppose it is me who is responsible.
5、强调句的常见句式变化
⑴ 强调句型的疑问结构
一般疑问句：Is/Was it that …?
特殊疑问句：特殊疑问词+is/was it that …?
Was it her that you were talking about?
Was it last year that you got the scholarship?
Where was it that you saw the man?
Who was it that you want to see?
How is it that your answer differs from his?
What is it that you want me to say?

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⑵“被强调的成分”如果是状语，且主句又为否定句时，通常发生“否定的转移” 。如：
①I did not see my mother again until last year.
→ It was not until last year that I saw my mother again.
②He did not feel happy until he saw her.

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