sound like + 名词
如果没有名词的话,再用动词加ing.
fun是名词,乐趣、如果是动词的话,意思是：开玩笑.
That sounds like a good idea.
What you said sounds like a mystery.
很高兴为你解答!
老师祝你学习进步!
望采纳,多谢你的问题!^_^