it's fun doing中的fun 是adj it's fun to do 是n .这种说法对吗?

it's fun doing中的fun 是adj it's fun to do 是n .这种说法对吗? It’s fun to do还是doing It's fun to do sth.中的fun什么词性 great fun 中fun的词性是什么It's Great fun +doing还是to do?这里的fun 为什么词性? It's fun to do和It's fun doing的用法 It's fun to do和It's fun doing的用法,具体一点,要有例句. it's fun to be it is fun to do 还是 doing? it's fun 还是it 's funny It's fun 后面是跟doing sth.还是跟to do sth. It's great fun ________ all the beautiful places in NanjingA.visit B.to visit C.visiting D.to visiting 选哪个?C 为什么?have fun doing sth 难道it's fun 后面也是doing? It's a good place____A.have fun B.having funC.has fun D.to have fun have fun doing sth have fun in doing have fun doing造句 have fun doing sth. It is fun?到底是It is fun to do sth 还是It is fun doing sth?It is fun for sb + What fun it is 和How fun it is 后面加doing还是to do