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1·It began to rain heavily when the train arrived.

火车到达时开始下起了大雨。

2·When l was on my way home, it suddenly started to rain heavily.

在我回家的路上，突然下起了大雨。

3·One day, the cow was eating grass when it began to rain heavily.

一天，牛正在吃草，突然下起了大雨。

4·It begins to rain heavily.

开始下大雨了。

5·Worse still, it began to rain heavily.

更糟糕的是，开始下大雨了。

6·After a little while, it started to rain heavily.

过了一小会，天就开始下大雨了。

7·It began to rain heavily while we were having dinner.

我们在吃晚饭时，开始下起大雨。

8·It does not rain heavily, but it never stops, either.

雨下得不大，就是一直都下不停。

9·It will rain heavily and blow hard tomorrow afternoon.

明天下午将要有大风和大雨。

10·The clouds above us say that it will rain heavily soon.

头顶上的云层预示着一场大雨即将来临。