it's fun to do 换成 感叹句是what fun 还是 how fun

it's fun to do 换成 感叹句是what fun 还是 how fun It’s fun to do还是doing 关于fun的感叹句fun可以是n,也可以是adj啊,到底她的感叹句是what fun!还是How fun! It is fun?到底是It is fun to do sth 还是It is fun doing sth?It is it's fun doing中的fun 是adj it's fun to do 是n .这种说法对吗? 是how great fun还是what great fun It's fun to do sth.中的fun什么词性 what fun it is to listen music 这里的fun为什么不能是形容词用how fun. 为什么能说What fun it is to do sth.却不能说How fun it is to do sth. what's fun to do around here 关于fun的感叹句It's fun to have a white Christmas!(感叹句)___________ 为什么感叹句中用 What fun而不用How fun