He knew it would not prove difficult 是什麼句型?

He knew it would not prove difficult to find a stranger in a it would not be difficult.和 it is not difficult有什么区别么 it always He knew before he started this building it would b He knew about the order but he would have none of it翻译 if he knew this ,it would have had to be by accident句子成分 It seems/seemed certain that...Byrd now knew that he would . He promised he would not do it any more if he ( )me about it ,I would not have knownit I don't think he would allow it.能否改成：I think he would not al Tom knew he would certainly get__if he was late home Tom knew he would certainly get__if he was late home. prove difficult 和 prove to be difficult 有什么区别?