After sunset, the sky darkened rapidly.

We stood up from the big stone, when the color of the sky was brighter than the early morning. Not suitable to walk far away again, we went on foot steadily in our way home.

You are in a strange city. It's late at night and you're tired. But you can't find your hotel.

About five o' clock it was blue enough outside to snap off the light.

The three of them walked on until it started to get dark.