I envy you.

我羡慕你。

It won't take much time.

不会花很长时间的。

The sky is getting very cloudy.

天空的云越来越多了。

It's her birthday and she wants to gives us all a treat.

这是她的生日，她要款待我们大家。

He came at a bad time.

他来的不是时候。

Let me tell you the story of my experience.

让我告诉你们我的亲身经历吧。