I'd say you're very happy these days.
这几天你很高兴。
How do you know?
你怎么知道?
There's always a smile on your face. And you talk much more than before. May I know the reason?
你脸上总是挂着笑而且也比以前能说了。我能知道原因吗?
To tell the truth , I've just got my article published in the newspaper.
告诉你实话吧，我的文章刚刚在报纸上发表了。
article n.物件;文章，论文;条款;冠词
publish vt.出版，刊印;公布，发表