“下雨”的英文是 rain。当描述下雨的动作时，可以使用以下例句：

1. It rains.

2. Don't forget to take your umbrella in case it rains.

3. What if it rains？

4. The rain began before sunrise.

5. The rain kept up all afternoon.

6. It's going to rain today by the look of it.