语法构成是什么?please check what's difference happen

语法构成是什么?please check what's difference happen What's the difference between"oblique" and "slant"?Please ex what's happen还是what happen? What's happen? what's happen please tell me what's happen这个语句法有错吗? What S The Difference 歌词 what's going to happen "what's happen"的"'s"代表什么 what's happen的S怎样理解 英语what's the difference/different between... What's the difference between them?