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 is fun?到底是It is fun to do sth 还是It is fun doing sth?It is fun for sb + 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 is+形容词+for sb+to do it is +形容词+for sb to do. It is necessary for sb to It is bad for sb to do sth.It is bad for sb to do sth. it is fun for us to write to each it is...for sb.to do...和it is...of sb.to do...的用法 是sth is important to sb还是 it is important for sb to do sth? it is +adj +for sb +to do 造句 写翻译 find it (is) +adj+for sb.+to do sth. It is + adj + for sb +to do sth It is adj 造句 for sb to do sth 造句 It is interesting for sb.to do sth造句 用 it is+adj.+for sb.to do 造句 It is adj.for sb.to do sth.句子成分 It is adj for sb to do是神马意思 有没有it is +n+for sb to do?