it is a great fun 还是it is great fun

英语的fun可数吗?是What a great fun it is!还是What great fun it is! A.It is of great fun. 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 请问那个正确 What a great fun it is to go surfing; What great fun great fun it is to . go boating it is great fun后应加什么时态 在这玩很有趣It is great fun It is great fun啥意思? It is great fun to do ... it is great fun +doing还是to do