dinosaurs have been completely died out on the earth,never (

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dinosaurs have been completely died out on the earth,never (being seen) again.
为什么不可以直接用 seen
With a report ( to write )about the accident,I have to find some witnesses for help.
为什么不是 written
It's likely that he is the only American hip-hop artist ( to have ever lived) in China.
为什么不是 having ever lived、、、
About 3100 chinese citizens ( stuck ) in Thailand had returned by Dec.3rd.
having been stuck 的用法错在哪里~(>_

1：如果我来做,我觉得seen也可以,但是我语感告诉我是being seen
2：with 复合结构里,有两种形式,一种to do 一种done,考虑与report之间的关系,翻译得是将要写这个报道,所以才要找证人,事情还没有做也用to do的形式,如果是done,表示已经做完了.
3：很明显这里是做后置定语来修饰这个人,而注意的是：having done 这个结构是不能做定语的.
4：同3,不能做定语
5：悬垂结构,只要记住就行了,如：GIven that,provided/providing that,juding from等等
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