fun就是完全形式。
vi. 開玩笑（非正式）
n. 樂趣玩笑We had a lot of fun that day.
那天我們玩的很開心。
It was such a fun movie.
這真是一部有趣的電影。
It could be fun to watch them.
看他們會是樂趣。
We're gonna have a lotta fun.
我們將玩得非常開心。
She's really fun to be with.
和她在一起真開心。
It's just a bit of harmless fun.
開個小玩笑罷了，並無惡意的。
She's very lively and full of fun.
她很活潑，挺有趣的。
