Breakdown of Mi compañero revisa el calendario cada mañana.
Questions & Answers about Mi compañero revisa el calendario cada mañana.
Mi is the unstressed possessive adjective, used directly before a noun: mi compañero, mi casa, mi libro.
- Mío is a stressed possessive pronoun/adjective and normally appears:
- After the noun: el compañero mío (more emphatic or contrastive)
- Alone instead of the noun: el mío (mine)
So:
- mi compañero = my colleague / my partner (neutral, most common)
- el compañero mío = a colleague of mine (more emphasis or contrast)
- el mío = mine
In your sentence, you just want the basic "my colleague", so mi compañero is correct.