在这玩很有趣It is great fun

在这玩很有趣It is great fun great fun it is to . go boating it is great fun后应加什么时态 A.It is of great fun. It is great fun啥意思? It is great fun to do ... What a great fun it is to go surfing; What great fun it is t 为什么是what great fun it is!而不是what a great fun it is! what a great fun it is to go fishing和what great fun it is to 英语的fun可数吗?是What a great fun it is!还是What great fun it is! 请问那个正确 What a great fun it is to go surfing; What great fun fun 是什么词性It is gueat fun 中great fun 可以用interesting代替吗