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1.Now imagine there has been a big earthquake. 现在，假设有一次大地震。

“There +be +主语+其它成分”结构中there为引导词，本身无意义，谓语动词按照就近一致原则。

其它相似句型还有：

There happen to be 碰巧有

There seems/appears to be 好像有

There is likely to be 可能有

There may/might be 也许有

There must be 一定有

There can’t be 不可能有

There is said/reported to be 据说/据报道有

There used to be 曾经有

There is sure/certain to be 一定有

2. happen to.

It (so) happened that…

Did you hear what happened to David last night?

你听说大卫昨天晚上发生什么事了吗?

What will happen to the children if Peter and Alice break up?

如果彼得和爱丽丝离婚孩子们将怎么办?

I happened to see Peter on the way to the bookstore yesterday.昨天我去书店的路上碰巧遇见了彼得。

It so happened that I saw Peter on the way to the bookstore yesterday.昨天我去书店的路上碰巧遇见了彼得。

I happened to be out when he called. 他来访时，恰巧我出去了。

(= It happened that I was out when he called.)

I happened on just the thing I had been looking for. 我偶然发现了我所要找的东西。

3. right away毫不迟疑，立刻

He is ill; you should call in the doctor right away. 他病了, 你应该立即请大夫来。

4. A smelly gas came out of the cracks. 裂缝里冒出臭气。

5. In the farmyards, the chickens and even the pigs were too nervous to eat.农家大院里，鸡甚至猪都紧张得不想吃食。

6. But the one million people of the city, who thought little of these events, were asleep as usual that night.但是，这个城市的一百万居民都没有把这些情况当一回事，当天晚上照常睡着了。

7. It seemed as if the world was at an end. 世界似乎到了末日。

从句表示“(在某人)看来好像;似乎”

① It seems/looks/appears as if/though…看起来好像…

② Sb./Sth. looks as if/though…(不用seem/appear)

③ There seems/appears(to be)…(不用 look)

There appears to have been a mistake. =It appears that there has been a mistake.

④ It seems so. =So it seems.看来似乎是这样。

8. In fifteen terrible seconds a large city lay in ruins.

在可怕的15秒钟内，一座大城市就沦落为一片废墟之中。