it is up to sb for sth 还是to do sh?

sb.spends some time doing sth.it is+adj.+for sb.to do sth.it's up to sb.to do sth.造句 各两句 It's up to sb to do it is up to sb to do it is up to sb for sth 还是to do sh? 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 _difficult for us_ climb up the mountain A too to B very tovery to 怎么不可以请问It's+adj+for sb.to do sth.句型来说为什么不能选B it's up to sb.to do sth. 1.not until 2.be going to 3.It's tine for sb to do 4.It takes sb sometime to do sth 5.look up 造句 请问,It is up to sb.to do sth. It is bad for sb to do sth.It is bad for sb to do sth. it's time did 与it's time for sb to do有什么区别例句：it's time we made up our minds.it's time for us to make up our minds 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 time We went to bed.是这个句型吗 It’s time(for sb．)to do sth it is...for sb.to do...和it is...of sb.to do...的用法 be up to sb’s it's important to sb.和it’s important for sb.的区别