it is up to sb to do

it is up to sb to do 请问,It is up to sb.to do sth. It's up to sb to do 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 is up to sb to do sth以及他的用法, it is up to sb for sth 还是to do sh? it's up to sb.to do sth. it is+形容词+for sb+to do it is +形容词+for sb to do. it is adj.of sb.to do sth.it is adj.from sb.to do sth. it is...for sb.to do...和it is...of sb.to do...的用法 It is bad for sb to do sth.It is bad for sb to do sth. it is left to sb.to do sth. sb.is up to sth. sb.is up to sth. it up to sb.to deside It is+adj.+to+sb.+to do sth. 和 “It is + adj.+for +sb.+to do sth.”的区别 是sth is important to sb还是 it is important for sb to do sth?