exist用法两句句子中个为什么第二个用ing形式啊?1.water doesn't exist on the moon

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exist用法
两句句子中个为什么第二个用ing形式啊?
1.water doesn't exist on the moon.
2.there is no water existing on the moon.

在第一个句子里,exist充当主要句子成分,即谓语动词.
由于是否定句,所以exist的前面用了助动词doesn't,帮助它形成否定.
第二句里,exist不是主要的句子成分.
这个句子是倒装句---there be + 主语,即谓语动词（is）跑到了主语（no water）的前面.
通常,如果 there + be + 主语,然后,后面要加上另一个动词,那么这另一个动词就要加ing.

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