(1)“it”引导的强调句
1)It + is/was + 被强调部分 + that/which/who/whom/whose + 句子的其他成分：
在这一结构中，如果被强调部分是人，用"that"，“who”，“whom”;如果被强调部分是物，用"that"或“which";强调状语时，只能用"that"，不能用"when"，“where” 和"why";强调的主语是复数，主句的谓语动词也得用单数。
It was uncle Bill、whose telephone number I lost.
It was we that/who arrived there first.
It was because it rained heavily that they didn’t go outing.
[注]①强调的成分通常为主语、宾语、宾补、状语以及由名词短语表示的主语补足语等。
It is Alice that/who looks pretty.(强调主语)
It was the wall that they painted white yesterday.(强调宾语)
It was yesterday that he put the wall white.(强调状语)
It Was the chairman of the Trade Union that we elected.(强调宾补)
②强调句中"who"或"that"后的谓语动词，应与前面被强调的名词或代词在人称、时态和数上保持一致。
It is I who have responsible for the organization.
It was he that/who painted the wall white yesterday.
③作表语的形容词不能用于强调句式。
误：It is beautiful that Helen is.
He is taller by far than any other student in his class.
He is by far the taller of the two.
④“No matter”+“关系代词/关系副词”加强语气：
No matter what you may say，1 won’t believe you.
No matter when our motherland needs us.we’ll respond to her call.
No matter how busy the president is，he often takes time off to give talks to the students.
⑤其他形容词、副词或词组用于加强语气：
Put it right in the middle.
Tom is absolutely right in doing this job.
This is just the word the author uses in his article.
I am anything but a kill-joy(扫兴的人).(=I am not a kill-joy at all.)
He is nothing but a worker.(=He is only a worker.)
He is nothing if not careful.(=He is very careful.)
They are the truest of friends.
The very act stepping on this soil was for me a far greater adventure.
The newspaper reporters got excited at the very sight of the Nobel Prize Winner.
It is beautiful song that Helen is singing.
2)“It+情态动词+be+被强调部分+that+…”表示强调：
It must be Mike that is listening to the music.
It might have been John who was in the traffic jam.
It would have been at that time that he went to live in London.
3)“It is/was + not until+被强调部分+that+…”表示强调：
