lt is fun to do sth.的fun 的词性是什么?

lt is fun to do sth.的fun 的词性是什么? It is fun to do sth造句 It is fun to do sth.造句. it is a great fun to do sth.还是it is great fun to do sth It is fun to do sth对,还是It is fun to doing sth lt is+adj+for sb+to do sth造句 what great fun it is+to do sth 吗 lt is +adj+to do为什么可以加fun,fun不是名词吗 It is great fun to do ...It is great fun to do sth还是It is a great fun to do 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 a fun和how fun的用法是what a fun it is to do sth还是how fun ? have fun doing sth 还是have fun to do sth? have fun doing sth.还是 have fun to do sth. having fun的用法是having fun to do sth?是having fun doing sth?还是having fun do sth? It's fun to do sth.中的fun什么词性 it is +形容词+to do sth ,为什么有些资料上是it's fun +to do sth,fun是形容词吗 请问一下有没有 There is great fun to do sth 这种用法? Forget to do sth.ask sb.to do sth.have fun doing sth.woul