英语句子分析: 辨别强调句型

When the real estate market began to change, it was because we had a diverse agent pool that we were able to stay in the real estate market much longer than others in the same profession.
当房地产市场开始改变的时候，就是因为我们有一个多元的代理团队，才使得我们能比其他同行更长久地在地产市场中生存。

强调句的句式为 “it + 动词be + 强调部分 + 从句”， 其中的从句通常由that引导, 即 it is/was….that….)，也可由which 或who(m)引导。 强调句式中的 “强调部分” 可以强调句子中的各种成分，例如强调主语、宾语、状语等。比如:
It was her that I saw in the museum yesterday. 昨天我在博物馆里见到的就是她。(这里强调宾语 “her”)。
It is from the sun that we get light and heat. 我们就是从太阳获得了光和热。(这里强调状语 from the sun)
It is she who had been wrong. 是她错了。 (这里强调主语)

强调句除了可以强调句子的某个成分之外，还可以强调整个从句。上面的这条句子就是强调了because we had a diverse agent pool这个状语从句。了解强调句可以强调整条从句，我们在阅读时遇到这种情况就不会出现困惑。这条句子详细的英语语法分析如下:

* when 为连词，引导时间状语从句。
* began 为谓语，采用一般过去时。
* to change 为不定式，作宾语。
* it 为形式主语，用于构成强调句式: it + be + 强调部分 + that...
* was 为谓语，采用一般过去时。
* because 为连词，引导原因状语从句。
* had 为谓语，采用一般过去时。
* were 为系动词作谓语，采用一般过去时。
* able 为形容词作表语。
* to stay 为不定式，作状语。

下面是另一条强调整条状语从句的例子。这条句子采用了经典的 it isn’t until…that…句型 (直到…才)
It wasn't until I attended a diversity workshop that I realized the person we passed over was the perfect person. 直到一次参加了种族多元化培训班，我才意识到之前放弃的那位候选者其实很好。 (其中pass over 意思为 “回避，忽略，不理会”)