K: It's Sunday today.
A: Yeah, what are you going to do today?
K: I'm going to study all day.
A: What are you going to study?
K: Well, web marketing and English as usual.
A: Oh, you're really serious about it.
K: Of course. I had fun yesterday, so I’ll study hard today.
A: Nice! Good luck with your studies.
I had fun：楽しかった（ファン）