1:this is a stage that show the youth2:I want to know that if one day i can smile with no regret3:I want be your friends all my life4:parents is the person that you should be appreciated and respected...谢谢你，不过还有几个问题，parents 后加is吗？once and for all 不是一劳永逸吗？vast sky the birds to fly 这个句子是什么结构呢？当然加，这是定语从句，sorry thisisthe right: parentsis the person that youshould be appreciated and respectedforalways.vast sky the birds to fly是句谚语，死记硬背就行，吧它用在作文上，有增色不少，doingeverythingisdoingnothing,这句就不能直译，而是：贪多嚼不烂