_____form the moon,the earth with water covering 70% of it's surface appears as a "blueball"这里的空为什么不用Seeing或者See,而用See的过去式Seen呢

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_____formthemoon,theearthwithwatercovering70%ofit''ssurfaceappearsasa"blueball"这里的空为什么不用Seeing或者See,而

_____form the moon,the earth with water covering 70% of it's surface appears as a "blueball"这里的空为什么不用Seeing或者See,而用See的过去式Seen呢
_____form the moon,the earth with water covering 70% of it's surface appears as a "blueball"
这里的空为什么不用Seeing或者See,而用See的过去式Seen呢

_____form the moon,the earth with water covering 70% of it's surface appears as a "blueball"这里的空为什么不用Seeing或者See,而用See的过去式Seen呢
Seen form the moon,the earth with water covering 70% of it's surface appears as a "blueball"
因为这是非谓语
逻辑主语是the earth,前后逻辑主语一致
所以前面从句的逻辑主语也是earth,因为地球是被看的,所以用过去分词表示被动
而现在分词表示主动
see是谓语,一句话不能有两个谓语的

因为后面的主语是the earth,地球不能主动地去看。。而是地球被看到。。

seen from the moon,the earth with water covering 70% of it's surface appears as a "blueball"
前面的那个名字的逻辑主语其实是后面的句子的主语 “the earth”
故用被动态,表示“地球被看起来。。。”的意思。

Seen from the moon, the earth with water covering 70% of it's surface appears as a "blueball"
主语是the earth,地球不能看,seeing,就是地球看。
而应该是 人来看,所以地球被看,地球被(人从月球上)看,所以就要用过去分词表示被动含义。

See的过去分词Seen 表示被动