We were about to go out when it started to rain.
我们就要出去，突然老天开始下雨了。
It began to rain as soon as we started out.
我们一出发，天就下起雨来了。
It started to rain when I was going out.
我正要外出时，天开始下雨了。
Fortunately the rain stopped before I started out.
动身前好在雨停了。
Fortunately the rain stopped before I started out.
动身前好在雨停了。
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