'He kept me waiting.' Change to passive voice and WHY?

I was kept waiting by him.

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i was being kept waited by him.
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your sentence is in past continuous;
i was kept being waited by him.
frame it according to this-
he was filing a report.
a report was being filed by him.
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I was kept waiting by him.

In thus passivised sentence, kept changes to was kept he becomes him and comes at the end of the sentence.
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