he is divided the cake into ten pieces.为啥不用dividing

问题描述:

he is divided the cake into ten pieces.为啥不用dividing

蛋白被分成了十块,这个是过去已经发生过的,应该是过去式,这个dividing是正在进行时,这句话中的is也应该去掉,应该是he divided the cake into ten pieces.他把蛋糕分成了十块,这个句子换成被动句就是the cake was divided into ten pieces by him.
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