I don't know whether you happen to have heard,but I'm going

来源：学生作业帮编辑：搜搜考试网作业帮分类：英语作业时间：2024/05/15 01:00:55

I don't know whether you happen to have heard,but I'm going to study in the USA this September.
我一直在纠结一个问题为什么这里要说you happen to have heard 而不是 you have happened to hear?

动词不定式的完成式,表示在谓语动词之前发生的动作,比如：
To have known her is a privilege.
This house seems to have been built by a very good architect.
By 1992,he hoped to have opened a branch overseas.
There is no need to have bought a new pair of shoes for me.
He is too young to have seen the old society.
They might have found him to have lived longer,had a particular circumstance not occurred.
The game was originally scheduled to have taken place in Rome.
i intended to have finished my worked last night.
你给出的句子也是一样,意思是：“我不知道你听说没有,今年九月我要到美国去学习了.”happen表示“碰巧”时,一般不用现在完成时,并且“听说”在说话之前,“碰巧”在后,所以用动词不定式的完成式表示.希望我能帮助你解疑释惑.
再问：碰巧和听说为什么有时间先后呢？应该是同时发生啊？
再答：一般来说，happen表示“碰巧”是不用现在完成时的，但是“听说”是说这句话之前就已经发生的，动词不定式必须用完成式形式，希望我能帮助你解疑释惑。
再问：那是不是hear不是在跟happen比较，而是在跟don't know之间比较时间先后？这么理解对吗
再答：对，可以这样理解，希望我能帮助你解疑释惑。

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