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This question already has an answer here:

‘Marvellous idea!’ Peter said. ‘They will do it themselves!’

Could I use "by themselves" here?

‘Marvellous idea!’ Peter said. ‘They will do it by themselves!’

marked as duplicate by Nathan Tuggy, Peter, fixer1234, Varun Nair, shin Jun 9 '17 at 12:22

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