今天天气多云。

Jīntiān tiānqì duōyún.

It's very cloudy today.

今天天空很多云，看不到月亮了。

Jīntiān tiānkōng hěn duō yún, kàn búdào yuèliang le.

It's very cloudy today, you can't see the moon.

天上的云慢慢地走，好像在散步。

Tiānshàng de yún mànmàn de zǒu, hǎoxiàng zài sànbù.

The clouds in the sky move slowly, as if they are taking a walk.