As a matter of fact... 不瞒你说……
1. As a matter of fact, we were just talking about you when you came in. 不瞒你说，你进来时我们正谈论你呢。
2. As a matter of fact, I was the one who did it. 其实，那件事是我做的。
3. I finished it yesterday, as a matter of fact. 实际上，我昨天就完成了。
A: I wish I could unsay① the sharp words to him. He must hate me very much.
B: He doesn't mind. As a matter of fact, he's very pleased.
A: Oh, really? Thank godness. 哦，是吗？ 谢天谢地!