不大写。Yes， there's plenty of room.

是的，还很空呢。

Yes， officer， I saw what happened.

是，警察先生，我看到了发生的事。

Yes， that's a good point.

是的，那是个有说服力的论据。

"Are you a friend of Nick's?"—"Yes."

“你是尼克的朋友吗”—“是的。”

Yes， I wrote the article. What of it?

是的，文章是我写的。那又怎么样呢

Yes， he is indeed a trustworthy person.

不错，他确实是个值得托付的人。

No， I can't marry you.

不，我不能嫁给你。Yes， what would you like to have tonight?

来了，今晚您要吃点什么呢