造句,it's + adg + for sb + to do sth （短语或句子）

造句,it's + adg + for sb + to do sth （短语或句子）
造句,
it's + adg + for sb + to do sth （短语或句子）

造句,it's + adg + for sb + to do sth （短语或句子）
It is important for us to learn English well.
It is good for us to help the old people.

it's + adg + for sb + to do sth
adg?不是adj的吗？