1. 助动词+动词原形 do/did/does 对谓语动词的一种强调
He does love me // He didn‘t steal his purse/wallet
2.最常用的强调句式
He gave me that fish
It was(时态和gave一致) he(被强调的部分) that/who gave(和was的时态一致) me that fish // that 通用 who 只能用人
It be 主语 that(who,whom,which,when,where) + 句子盛夏部分
宾语
状语
// 强调主语
It is Ace who/that teaches us English
It might have been(猜测强调) Jhon who gave Mary a handbag.
it is I who/that am wrong
// 强调宾语 删除之后是非陈速语句,但是在强调句式正常的
it is English tha/which Ace teaches us(English)
It was Professor Liu that/whom I met(Professor Liu) in the street yesterday
// 强调状语
It was yesterday that/when they got married
It was in 1986 that they got married.// 介词短语 被强调的部分为介词短语时只能用that
It was 2012 that/when(只能用when) Ace rose to fame
It was in 2012 that/when(只能用that) Ace rose to fame
it was 2012 when/in which Ace rose to fame
it was the railyway station where/at which I met (在station用at)Li Ming yesterday
特别结构的强调句子
It was because that the water had risen that they could not cross the river
it was not until his wife came back that he went to bed
==he didn‘t go to bed until/till his wife came back.
1. be 的时态是可以改变的
2.被强调的是 介词短语 只能使用that
3.强调宾语是，语序非陈述但正常
4.介词的缺失可能转变为定语从句
It is strange that you should(竟然) like him // 强调句 或者形式主语 that you should(竟然) like him is strange
It was i that put forward the question
It was the railway station where i met jack // 没有at 是定语从句
原文：http://www.cnblogs.com/1018475062qq/p/7107972.html