it is great fun +doing还是to do

it is great fun +doing还是to do it is fun to do 还是 doing? It is fun to do sth对,还是It is fun to doing sth It is fun?到底是It is fun to do sth 还是It is fun doing sth?It is It is great fun to do ... It’s fun to do还是doing what great fun it is+to do sth 吗 it is a great fun to do sth. it is fun to do和it is fun doing区别 it is fun to do 与it is no fun doing 与 it is fun doing三者的区别是什 have fun+doing吗还是to do great fun it is to . go boating