强调

强调句型

基本结构

It is/was + 被强调部分 + that/who + 其他。
可以强调句子的主语，宾语或者状语等，一般不用来强调谓语。
特殊情况下也可能是表语（当系动词不是be,且表语部分是名词性词组时）。
强调人且是主语可用that或who，强调其他一般用that。
that 和 who不能省略。
it为形式宾语，无意义。
被强调部分是若是句子的主语，that/who 之后的谓语在人称和数上应该与句子的主语保持一致。

-例句
It was Haydn who encouraged Beethoven to move to Vienna.
是H鼓励B移居维也纳的。（强调主语）
It was all my mistakes that I didn't realize until you told me yesterday.
直到你昨天告诉我，我才意识到自己所有的错误。（强调宾语）
It was 80 years before he died that the tree was cut down.
早在他死的八十年前，这棵树已经被砍倒了。（强调时间状语）
It was in Paris that we had a wonderful holiday last summer.
去年夏天在巴黎，我们度过了一个愉快的夏天。（强调地点状语）
It was chairman of the committee that they elect him.
他们选举他为委员会主席。（强调宾补）
It is head of the department that he becomes now.
他现在成为部门负责人。（强调表语）

时态

如果是现在的某个时态，那么用 is
如果是过去的某个时态，那么用 was
有时还可以用 might be / must have been ... that ...

-例句
It is Tom who gets to school earliest.
最早到校的是Tom.
It was with the help of the local guide that the mountain climber was rescued.
在当地导游的帮助下，他们才得以脱困。
It might be his father that/who you are thinking of.
你想起的可能是他的父亲。
It must have been his father that you saw.
你看见的一定是他的父亲。

疑问形式

1）一般疑问句
Is/Was it + 被强调部分 + that/who + 其他

-例句
Is it Professor Wang who teaches you English?
教你们英语的是王老师吗？
Was it in 2016 that Rio held the Olympic Games?
里约是在2016年举办的奥运会吗？


2）特殊疑问句
特殊疑问词 + is/was + it + that + 其他

-例句
When was it that China held the Olympic Games?
中国是在何时举办的奥运会
When was it that made you so happy?
到底是什么让你这么高兴

not ... until ...

当强调 not ... until ... 句式时应把not和until部分一起放在被强调部分。
主从句均为陈述语序。 

-例句
It was not until I came here that I realized this place was famous for not only its beauty but also its weather.
直到来到这里我才意识到，这里之所以出名，不仅是因为它的美丽，还因为它的天气。
Was it not until yesterday that is was made public?
直到昨天才予以公示吗？

强调谓语动词

要点

强调句型不能强调谓语动词，应用助动词 do 的不同形式（即 do, dose, did），后接动词原形。（do 表强调时，只用于肯定句，只有一般现在时和一般过去时。） 

-例句
I do think she's behaved badly.
我确实认为她的行为很糟糕。
She did at least write to say thank you.
她至少还写了信道谢。