what happens what was happened what happens what is happening的区别和用法?

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whathappenswhatwashappenedwhathappenswhatishappening的区别和用法?whathappenswhatwashappenedwhathappenswhat

what happens what was happened what happens what is happening的区别和用法?
what happens what was happened what happens what is happening的区别和用法?

what happens what was happened what happens what is happening的区别和用法?
happen是不及物动词,没有被动语态,所以what was happened 是错误的,把was去掉变为what happened ,表示过去发生什么.比如:What happened to him yeaterday?
what happens 表示一般现在时的动作,发生什么了?
what is happening?指现在进行时,正在发生什么事?