Final answer:
The correct past participle for the Spanish verb cantar is cantado.
Step-by-step explanation:
The correct past participle for the Spanish verb cantar is cantado. The past participle is used to form compound tenses in Spanish, and it agrees in gender and number with the subject. For example, if you want to say 'I have sung,' you would use 'he cantado' for a male speaker or 'he cantado' for a female speaker.
Learn more about Spanish verb conjugation