Learn Turkish: Müzik başlamadan önce herkes hevesleniyor olacak. - Everyone will be getting enthusiastic before the music starts.

It is built from the noun heves, which means enthusiasm or eagerness. By adding the state-acquisition suffix -len (a variation of the -lAn suffix taught in this lesson), we get the verb heveslenmek, meaning to become enthusiastic. Finally, the -iyor suffix is added for the present continuous aspect.

Why are there two tense markers in hevesleniyor olacak?

This combination creates the future continuous tense, which translates to will be doing in English. It is formed by taking the main verb in the present continuous form (hevesleniyor) and following it with the future tense of the auxiliary verb to be (olacak). Together, they mean will be getting enthusiastic.

Could you remind me how the structure başlamadan önce works?

To say before doing an action in Turkish, you attach the suffix -mAdAn to the verb root, followed by the word önce. Here, başla (start) becomes başlamadan önce (before starting). Even though the suffix -mAdAn on its own translates to without doing, when paired with önce, it creates the standard before doing structure.

Since herkes means everyone, why isn't the verb plural (olacaklar)?