It’s fun to do还是doing

It’s fun to do还是doing 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 is fun to do 还是 doing? it's fun to do 换成 感叹句是what fun 还是 how funit's fun to play with them=______ _______ it is to play with them. It's fun to do sth.中的fun什么词性 It's fun 后面是跟doing sth.还是跟to do sth. spend的用法 是TO DO STH 还是DOIN STH it is a great fun to do sth.还是it is great fun to do sth 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. 动词+doingdislike+doin？+to do？ It is fun to do sth对,还是It is fun to doing sth it's fun doing中的fun 是adj it's fun to do 是n .这种说法对吗? it is great fun +doing还是to do what a fun和how fun的用法是what a fun it is to do sth还是how fun ? What fun it is 和How fun it is 后面加doing还是to do It is great fun to do ...It is great fun to do sth还是It is a great fun to do sth? It's a fun to do sth.fun是不可数名词为什么还要加a?