He would rather stay alone than gossip with his co-workers in his spare time.

他宁愿一个人呆着，也不愿在业余时间和同事们闲聊。

I do not want to stay alone.

我不想(一个人)独处。

Let me not stay alone here, please.

请不让我一个人留在这。

He feared to stay alone in the forest.

他害怕独自一个人留在森林里。