作业帮she was on her knees scrubbing the kitchen floor子里为什有was过去式与ing现在进行
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she was on her knees scrubbing the kitchen floor子里为什有was过去式与ing现在进行
she was on her knees scrubbing the kitchen floor
子里为什有was过去式与ing现在进行
she was on her knees scrubbing the kitchen floor子里为什有was过去式与ing现在进行
scrubbing这里并不是谓语了,而是伴随状语,是现在分词做伴随状语.如果想进一步了解,可以参照百度百科里面的【非谓语】词条.
She was on her knees这部分是主句，意思是“她跪在膝盖上/跪在地上”；scrubbing ……是现在分词短语起补充说明“刷洗厨房地板”。
这个句子也可以这样看：She was on her knees while she was scrubbing the kitchen floor。因为while 引导的从句中she was与主句中的she was 是重复的，所以在省略...
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She was on her knees这部分是主句，意思是“她跪在膝盖上/跪在地上”；scrubbing ……是现在分词短语起补充说明“刷洗厨房地板”。
这个句子也可以这样看：She was on her knees while she was scrubbing the kitchen floor。因为while 引导的从句中she was与主句中的she was 是重复的，所以在省略while的时候，she was 也被省略了。
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