This is the 1250th most frequent Catalan word.
heu
"Heu" means "you have" (second person plural, auxiliary verb).
In this sentence, "heu" is the second person plural form of the verb "haver" used in a verbal perífrasis indicating obligation.
Heu d'enviar els documents abans de dilluns.
You need to send the documents before Monday.
Here, "heu" is the second person plural form of the auxiliary verb "haver," used to construct the present perfect tense.
Heu crescut molt des de la última vegada que us vaig veure.
You have grown a lot since the last time I saw you.
In this example, "heu" acts as the auxiliary verb in the second person plural form for forming the perfect tense.