【摘要】：2013四级考试进入了最后的冲刺阶段，语法的知识点是难点和重点，以下是精品学习网特为考生们整理了2013英语四级语法;这是形式主语it还是there be句型，希望能给广大考生们在复习中作出一点贡献。预祝考生们通过考试!
下面这道题是考查形式主语it还是there be句型?
Have __________ been any changes in your home town?
A. it B. you C. that D. there
此题应选D。容易误选A，误认为这里应填形式主语。
其实考生只要想一想，假若选A，it是形式主语，那么请问此句真正的主语是什么? (找不到!)
正确的分析：此句为there be-句型，这里要特别注意的是：there be-结构不仅可以有各种时态，而且还可以与情态动词以及 happen, appear, seem 等动词连用。本题用的就是there be-句型的现在完成时态的一般疑问句形式。
以下各句用的是否是 there be-句型，你看得出来吗?
1. There is going to _________ an English film the day after tomorrow.
A. have B. be C. do D. see
2. _________ have been many such accidents here.
A. It B. There C. They D. We
3. ________ used to be a big tree in front of the old house.
A. It B. There C. They D. That
4. There must have _________ something wrong with the machine.
A. been B. gone C. had D. done
5. _________ happened to be a foreign teacher there.
A. It B. There C. They D. That