They reached the town before it got dark.
天未黑前他们就到了镇上。
We needed to cover another 30 miles before it got dark.
天黑以前我们需要再走30英里。
As it grew dark, the boy realized how tired he was and he got up to leave, but before he had gone more than a few steps, he turned around, ran back to the old woman and gave her a hug.
天色晚了，男孩觉得累了，于是起身离开。但是没走几步，他又转过身来，跑回到老婆婆的面前给了她一个拥抱。
Have you got to finish it before dark?
你必须天黑前完成吗？
It got dark before they could get home.
他们还没到家，天就黑了。
It got dark before they could go home, so the friends have to spend the night in the old Black Tower on the mountain.
他们还没有回家，天就黑了，于是朋友们只好在山上的黑塔里过夜。
It got dark before they could go home, so the friends have to spend the night in the old Black Tower on the mountain.
他们还没有回家，天就黑了，于是朋友们只好在山上的黑塔里过夜。
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