It could be fun to watch them.
看着他们就很有意思.
Liz was wonderful fun to be with.
莉兹是个非常有趣的伙伴.
What a fun person he is!
他多么有趣啊!
He had just come for the fun of it.
他来只是为了好玩.
Don't say such things, even in fun.
不要说这些话,就算是开玩笑也不行.
Don't make fun of me.
不要取笑我.