What's happened to him?这句话中的's指什么是is还是has呢,

happen用法what's happened to you What's happened toyou what happen to you what's happened to you what happened to you和what's happened to you的区别那个对? what happened to sb和what's happened to sb区别 是What happened 还是what’s happened what happened=what's happened吗? what happened to 和what happened What Happened to Us Dear,what happened to what happened to she what happened to him? what happened to what happened to the what happened to Tom's car?变为同义句 what's happened to them 's=has?为什么不是have 是them 为什么不是what've happened to them what happened to you的同义句what ___ ___ to you?what's ___ ___you? what happened to your memory?和 what's happened to your car?在语法上有什么区别. What happened to him?(同义句)What's_____with him?What's the__________? what （）to her last night?what's she crying for?A happenedB is happenedC was happened D had happened