3. 强调状语 
      It was to a nearby hospital that Ann Peters' husband rushed her last night.
      昨晚安妮.彼德的丈夫立即送她去的就是一家附近的医院。 
      It was last night that Ann Peters' husband rushed her to a nearby hospital.
      就是在昨晚，安妮.彼德的丈夫立即送她去附近医院。

      由例子可以看出，强调不同的部分意义有所不同。

      要点提示： 
      1）当原句叙述的是现在或者将来发生的事情用"It is … that…"的句式
      例：It is that man that is teaching our English.
      　　就是那个人教我们英语。 
      当原句叙述的是过去发生的事情则用"It was … that… " 的句式。 
      例：It was my telephone number that Miss White happened to know.
　         怀特小姐碰巧知道的就是我的电话号码。

      2）在强调句型中，一般用that引出句子的其他部分。如果被强调的部分是表示人时，可以用who代替that,其余都用that。
      例: It was you who/that we were talking about.我们刚刚谈论的就是你。
      
      3）It was not until...that ...也是一个强调句型。
      例：It was not until yesterday that I finished the book. 直到昨天我才写完了这本书。
      原句为：I didn\'t finish the book until yesterday. 

      4）在强调主语时，注意that/who后边的动词应和主语在人称和数上保持一致。
      例：It is my parents who/that are singing in the next room.
            就是我的父母正在隔壁房唱歌。
      　　It is I who/that am going for a holiday with Mary.
            是我打算和玛丽一起去度假的。

      5）有时对判断究竟是强调句还是定语从句会有疑问，可以套用这个规则来判断：如果是强调句，去掉it is/was和that/who还是一个完整的句子，如果是定语从句，则不是。
      看看这道题，应该选择哪个选项呢？
      It ______ at the crossroads ______ he was killed in the accident the other day.
      A. is; that                          B. was; that   
      C. is; where                   D. was; where
      答案为B，套用以上的规则，去掉it is和that，原句变为at the crossroads he was killed in the accident the other day，也就是he was killed in the accident the other day at the crossroads，可判断出此句应为强调句型。
      比较以下三个句子：
      It is the mountain village where/at which I stayed last year.(定语从句）
      It was a mountain village that I visited last year.（强调句）
      This is the mountain village (which) I visited last year.（定语从句）