Questions & Answers about Mi abuelo no se peina.
Why is there a se before peina?
The verb here is peinarse (to comb one's hair), which is a reflexive verb. Because the grandfather is performing the action on himself, we need the third-person reflexive pronoun se (himself) to match mi abuelo.
Why does no go before se instead of after it?
In Spanish, the negative word no must go before the entire verb phrase. Reflexive pronouns like se always stick right next to the conjugated verb, so no is placed directly in front of the pronoun. You cannot separate se and peina with a no.
The English translation says 'his hair', but there is no Spanish word for 'his' or 'hair' in the sentence. Why?
In Spanish, reflexive verbs for daily routines usually imply the body part being groomed. Se peina literally means 'he combs himself'. Spanish speakers do not need to add the words for 'his hair' because the reflexive pronoun se already makes it perfectly clear whose hair is involved.