"what's happen"的"'s"代表什么到底是has还是is？还有我在书是上看的就是what's happen

What's happen? what's happen what's happen的S怎样理解这样表示对吗 what's going to happen 请问：happen的用法.eg:what happened,what's happen的区别 swwety,what 's happen to you? What's Going To Happen 歌词 What's happen?是词组吗 what's happen的's代表什么到底是has还是is？还有我在书是上看的就是what's happen happen用法what's happened to you What's happened toyou what happen to you what's happened to you It's doesn't matter what happen to the weather.的意思? what's the w____ things that could happen?是新概念里的 What ____(happen) at Alan's Supermarket last night. What's the best thing that ever happen to you? What _______ (happen ) over there?Let's go and see. Let's just live and what happens will happen 语法构成是什么?please check what's difference happen let's go and see what ____(happen）outside