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

It is fun to do sth造句 It is fun to do sth.造句. It's fun to do sth.中的fun什么词性 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' 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 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 a fun to do sth.fun是不可数名词为什么还要加a? have fun doing sth 还是have fun to do sth? have fun doing sth.还是 have fun to do sth. It's fun 后面是跟doing sth.还是跟to do sth. 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 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 having fun的用法是having fun to do sth?是having fun doing sth?还是having fun do sth? 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?