do sth for fun

do sth for fun do sth for fun后加什么 It is fun?到底是It is fun to do sth 还是It is fun doing sth?It is fun for sb + have fun doing sth 还是have fun to do sth? have fun doing sth.还是 have fun to 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? 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 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'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 a great fun to do sth.还是it is great fun to do sth do for fun 意思是? Forget to do sth.ask sb.to do sth.have fun doing sth.woul It is fun to do sth对,还是It is fun to doing sth 是have fun doing sth 还是have fun to do sth? have fun to do sth与have fun doing sth的区别 what do you usually do for fun