is +adj+ for /of to do sth 中,for /of的问题请问it is +adj+ for /of to do sth中,什么时候用of,什么时候用for

is +adj+ for /of to do sth 中,for /of的问题请问it is +adj+ for /of to do sth中,什么时候用of,什么时候用for
is +adj+ for /of to do sth 中,for /of的问题
请问it is +adj+ for /of to do sth中,什么时候用of,什么时候用for

is +adj+ for /of to do sth 中,for /of的问题请问it is +adj+ for /of to do sth中,什么时候用of,什么时候用for
it is +adj+ for /of sb + to do sth
一般说来,如果能构成“sb is +adj”结构,就用of,否则用for.
It's very kind of you to help me.(You are kind.---行)
It'very important for us to learn English well.(We are important.--不行)

of表示人的内在特征、性格等，与某个具体的人有关，如nice,foolish,honest<诚实>等，
而当强调某事怎样时，常用for,如important,necessary,等
希望您满意