Always first from of the verb (V1) is used with modal auxiliaries.

Example: He may won / the championship as he / is the defending champion. / No error

Explanation: According to the rule given above there is an error in the first part of the sentence, first form of the verb ‘win’ should be used in place of ‘won’. So, the correct sentence should be:

He may win the championship as he is the defending champion.

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