Word: 天黑 (tiānhēi)

天黑了，况且还下着雨。

Tiānhēi le, kuàngqiě hái xià zhe yǔ.

It's dark, and moreover it's raining.

天黑了，家家户户亮起了灯。

Tiānhēi le, jiājiā-hùhù liàng qǐle dēng.

It got dark, and the lights came on in every home.

天黑以后，路灯会自动开启。

Tiānhēi yǐhòu, lùdēng huì zìdòng kāiqǐ.

After dark, the street lights come on automatically.

天黑以后，部队开始撤退。

Tiānhēi yǐhòu, bùduì kāishǐ chètuì.

After dark, the troops began to retreat.

天黑得很快，好似要下大雨了。

Tiānhēi de hěn kuài, hǎosì yào xià dàyǔ le.

It's getting dark fast, as if it's about to pour.

晚霞慢慢退去，天黑了。

Wǎnxiá mànmàn tuìqù, tiānhēi le.

The afterglow slowly faded, and it got dark.