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這是形式主語it還是there be句型

下面這道題是考查形式主語it還是there be句型?

Have __________ been any changes in your home town?

A. it                        B. you              C. that                        D. there

此題應選D。容易誤選A，誤認為這里應填形式主語。

其實考生只要想一想，假若選A，it是形式主語，那么請問此句真正的主語是什么? (找不到!)

正確的分析：此句為there be-句型，這里要特別注意的是：there be-結構不僅可以有各種時態，而且還可以與情態動詞以及 happen, appear, seem 等動詞連用。本題用的就是there be-句型的現在完成時態的一般疑問句形式。

以下各句用的是否是 there be-句型，你看得出來嗎?

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

6. There seems to __________ a storm soon.

A. have                   B. be                      C. fall                       D. blow

答案：1. B 2. B 3. B 4. A 5. B 6. B