恐龙不是已经灭绝了吗?这句话英文怎么翻译?

问题描述:

恐龙不是已经灭绝了吗?这句话英文怎么翻译?

以下两种形式都可以:
Haven't the dinosaurs died out?
The dinosaurs have died out,haven't they?
恐龙群体都已经灭绝了,所以要用复数,并且要用现在完成时的反义疑问句.