2个句子的辨析astheearthcooleddown,waterbegantoappearonitssurface.withtheearthcoolingdown,waterbegantoappearonitssurface.这两句中为什么一个用cooleddown另一个用coolingdown

Question

2个句子的辨析
as the earth cooled down,water began to appear on its surface.
with the earth cooling down,water began to appear on its surface.
这两句中为什么一个用cooled down另一个用cooling down

Answer 1

随着地球冷却下来,水开始出现在其表面.
as the earth cooled down,water began to appear on its surface.
——从语法角度说,更易理解,也是由as 引导的从句,是复合句,自然前后都是句子.所以用过去时.clooled
而下面这句,是with引导的伴随结构,是个分词结构——不要忘了,一个句子,只能有一个谓语动词,其它的,都要改成或分词,或不定式等形式.
下面不是复合句,而不一个简单句.
with the earth cooling down,water began to appear on its surface.
地球降了温,水就开始出现在其表面.
OK?
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