The weather changes black.
天变黑了.
The day had reached its close.
天已黑了.
It is more and more more black.
天越来越黑了.
It's get dark outside.
外面天愈来愈黑了.
It will be dark before eight o'clock.
八点以前天就黑了.
Why,it's getting dark!
呀,天已经快黑了.
It's gey dark and getting darker.
天已很黑了,而且愈来愈黑了.
It is growing dark.
天渐渐的黑了.
It was getting dark.
天渐渐地黑下来了.