It is fun to do sth.句型fun的词性这里的fun是什么词性?名词还是形容词?怎么分成两派了我记得好像这是个特殊的给我一个肯定的答复啊~

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 what great fun it is+to do sth 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 ? 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 it is fun for sb to do sth?it is fun for doing 加上for sb 是用doing?还是用to do? It's fun to do sth.是将动词不定式做了主语,那么该动词不定式能改成动名词吗,为什么?因为It's fun to do sth=To do sth is fun.那么有没有It's fun doing sth呢?另外，Eating food is good for your health能不能改为It' it is fun to do 还是 doing? what fun /how fun 的用法,最好列举全面第一个问题：What fun it is to do sth.还是doing sth.还是两个都可以用,但表达意思不同,如果换成How fun it is呢to do sth./doing sth.第二个问题：what a (fun) time____ listen __ It' fun to do sth 这句有没语法错误,It's+ adj 后面什么时候加to do sth 什么时候doing sth 为什么是what fun it is to.而不是how funn it is to.it is fun to do sth中fun不是形容词吗?译为有趣的的意思ba 英语翻译这么热的天在海里游泳真是很有趣 （it is such fun to do sth.) 这么热的天在海里游泳这是有趣.《it is such fun to do sth>用英语翻译