1.It is for us to do something to protect forests.It is time for us to ____ ____ to protect forests.2.Harbin is in north-east ChinaHarbin is in ___ ___ ___ ____3.尽量在这个房间腾出一张床的位置来Try to ___ ___ ___for a bed in the room.

It is important( ) A for us to do eye exercise B for us to do eye exercise C of us to do exercise DB for us to do eye exercises It is diffcult for us to do it It是形式主语 is diffcult是谓语 for 是介词 to do it是真正主语吗 it is adj of sb to do与it is adj for sb to do区别例题It is hard _______englishAof us to learn Bfor us to learn Cof us learning Dfor us learning I think it important for us to do something 什么情况下is可以省略吗? for boring jobs us it is do simple the to 连词成句 what ( ) walking there?It is easy for us to do so.用适当的介词填空 for boring jobs us it is do simple the to,连词成句. This exercise is too difficult for anyone of us to do it.这句话算错吗? 为什么The exercise is too difficult for anyone of us to do it?错了. It is beneficial for us to do morning exercise.还是It is beneficial to us to do morning exercise.beneficial怎么用,是to sb 还是for sb.像 Sunlshine is beneficial to plants这里是用to 的. This exercise is ___ different ____.A so;that few of us can do B so;that few of us can do itC very;for anyone of us to doD very;for anyone of us to do it it is happy _______ us to help people in need.----Yes.And it is polite _____ us to do so.it is happy _______ us to help people in need.----Yes.And it is polite _____ us to do so.A.for ,for B.for ,of C.of ,for D.of ,of it's+adj.+for sb.to do sth.若for改为to用法!it is adj.to sb.to do sth.是一定存在的,eg:it is helpful to us.it is good to me.it is adj for sb.to do sth.出现更多：it was too hard for me to carry them.请问在什么时候用to,for,这个 It is beneficial to us to read.还是It is beneficial to us for reading. Helping the old and the weak is a good verture,and (still ),it is necessary for us to do.为什么、 It is () for us to learn to wait in line it is fun for us to write to each it is+形容词+for sb+to do