what's up 和 what happen这两个都是发生什么事情的意思吗 有什么区别

what's up 和 what happen这两个都是发生什么事情的意思吗 有什么区别 what's been up?和what's up?什么区别 what's up和what's the matter的区别和用法有什么不同? what happen和what happened有什么区别 s'up 能不能表示问候或打招呼的意思?跟what's up有什么区别? what has happen 和what was happen 和what happen有什么区别,它们后面都能加to what's weird & what's the weird 有什么区别 都是正确的句子吗 "what's happen"的"'s"代表什么 what s up 什么意思 what's up?什么意思? what's-up?什么意思? What's the matter?和What's up?有什么区别