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covering them with all the clothes she could find

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covering them with all the clothes she could find
这里的cover为什么要加ing形式呢?
前边的呢?句子不完整啊
再问: she turned a suitcase into a bed and put the children inside it, covering them with all the clothes she could find.
再答: "she turned a suitcase into a bed and put the children inside it"中,已经有了句子主谓成分,所以不能再有其他主语,而cover这个动作的发出者也是she,这里是用动名词引导的“covering them with all the clothes”来作伴随状语了。 如果后面动作的发出者不是she,而是另一个人的话,比如Tom,那么会变成“she turned a suitcase into a bed and put the children inside it, Tom covering them with all the clothes she/he could find.”这样就是独立主格结构了(当然,这个变出来的句子不太合逻辑,不过独立主格就是这样的,顺便记一下吧)
再问: 如果第二句改成了Tom的话cover还是用加ing的形式吗?那Tom前面不需要加be?