问个比较低级的,白云飘浮在天空中,这句英语怎么译?

cloud flows in the sky.

Clouds are floating in the sky.

a cloud is floating upon the sky

White clouds floating in the sky

White clouds floating in the sky.
我写的是一个没有谓语的句子,表示一种伴随状态．若要写句子的话,可以在White clouds 后面加上are．