clawing the air 现在分词作后置定语修饰legs
首句用的是现在完成时强调当前产生的影响,与之相对的过去事实只能用一般过去式不能用过去完成时.
在任一个波多黎各人的家中,最基础的礼节是要求（家中）所有可以用的食材都要（与客人）分享.be available肯定不对,从句时态要与主句时态一致,由demanded得知使用过去式故改为was.
Persident Lincoln,walking with a friend,turned back to assis
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