'A' functions as the verb in the sentence- it's a form of the verb 'avoir' (to have) in the 3rd person singular il/elle/on (he/she/it). ... (He has brown and wavy hair) 'As' is another form of the verb 'avoir', this time conjugated in the 2nd person singular tu (you). Example: Tu as les cheveux bruns et ondulu00e9s.