happened and happeningwhat is happening是对的,那what did happen难到不是对的吗?都是怎么了?都有助动词,那后者为什么是错的?如过错了为什么不同?is 是助动词

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happened and happeningwhat is happening是对的,那what did happen难到不是对的吗?都是怎么了?都有助动词,那后者为什么是错的?如过错了为什么不同?is 是助动词
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happened and happeningwhat is happening是对的,那what did happen难到不是对的吗?都是怎么了?都有助动词,那后者为什么是错的?如过错了为什么不同?is 是助动词
happened and happening
what is happening是对的,那what did happen难到不是对的吗?都是怎么了?都有助动词,那后者为什么是错的?如过错了为什么不同?
is 是助动词

happened and happeningwhat is happening是对的,那what did happen难到不是对的吗?都是怎么了?都有助动词,那后者为什么是错的?如过错了为什么不同?is 是助动词
what is happening is不是助动词
what did happen不对,
如果想要表达过去的意思,直接What happened用就好了
另外还可以用完成时 What has happened?

问what happened事情已经发生;
问what’s happening?事情正在发生。
“What happened?”属于陈述句、肯定句,
这句话的主语是what,动词是happen,
由于时态是一般过去时,
(动作发生在过去),
所以动词用过去式,
而“what did happen?”就不对了,
因为过去时陈...

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问what happened事情已经发生;
问what’s happening?事情正在发生。
“What happened?”属于陈述句、肯定句,
这句话的主语是what,动词是happen,
由于时态是一般过去时,
(动作发生在过去),
所以动词用过去式,
而“what did happen?”就不对了,
因为过去时陈述句的一般结构为“主语+过去式”,
所以did是多余的,

实义动词用于肯定陈述句的一般结构为(以一般过去时为例):
“主语+过去式”
而这类句子要变成否定句,
就需要在实义动词前加助动词did,再加not,
再把动词变成原形,
即:What did not happen?
而变成疑问句,
则需要在句首加did,
动词变原形
即:Did what happen?

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