Perfect gerunds: The children had drawn many pictures on the wall.they denied that they had done it

Perfect gerunds
1.the children had drawn many pictures on the wall.they denied that they had done it
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 2.my sister had von the first prize in the singing contest.we congratulate for it.
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3.Many computer in the office had been stolen.the police suspended a young man of doing it.
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4.Her students hadn't submitted the exercises on time.They apologies for that.
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