What's happened to Mary?=What has happened to Mary?
happen 没有被动语态,常见的有两种形式
what happened 的happened是过去时,加ed.
what is happening是现在进行时,“be+doing‘
而被动语态结构是“be +vt-ed+(by)”by可省略,注意,vt是及物动词.
What's happened to Mary?里的's 是什么的简写?
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