what fun it is和how fun it is

what fun it is和how fun it is What fun it is How fun it is ,怎么用,仔细点 为什么说what fun it is!而不用how fun it is?这是什么句型? what a great fun it is to go fishing和what great fun it is to what fun it is to swim 为什么不能用how? _____ fun it is!A.What B.How _____ it is to visit the science museum!A.What fun B.How fun __ it is to play with snow in winter!A How fun B what a fun what fun it is to listen music 这里的fun为什么不能是形容词用how fun. What fun it is 中fun是什么 (表语吗) what fun day it is?为什么用fun,不用funny 如题What fun it is中fun是什么