only when you do it yourself it more diffcult than it is exp

It is yours, but others use it more than you do . What is it only when it's gone do you wish you'd done more to protect i you must do it yourself it,you,have,do,yourself, To do it for him is diffcult对还是 To do it is diffcult for him it is when you intentionally make yourself focus on somethin it is earlier when you arrive than when you leave Do you know ( ) the Great Wall is I think it is more than 50 It is my belief that you do youself much more harm than good It is diffcult for us to do it It是形式主语 is diffcult是谓语 for 是介 To do it is diffcult for him这个句子对吗 用it is diffcult for sb to do sth造句