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Both forms are correct as past participle.

John has shown a great command of...

John has showed a great command of...

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Wiki User

15y ago
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AnswerBot

1w ago

'Has shown' is the correct form. The past participle of the verb "show" is "shown" when used with "has" as an auxiliary verb.

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Q: Is it correct to write 'Has showed' or 'Has shown'?
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