Learn Turkish: Bu öğrenci nereli? - Where is this student from?

While -den means 'from', it is usually used to talk about physical movement, like traveling from a city. To ask about someone's origin, hometown, or nationality, Turkish uses the suffix -li. So nereli is specifically asking about a person's roots or nationality.

How is the word nereli built?

It combines nere (what place) with the suffix -li (which means 'with' or 'belonging to'). When added to places, -li describes a person from that place. For example, Ankaralı means someone from Ankara, and nereli asks what place someone belongs to.

Where is the verb 'is' in this sentence?

In Turkish, the present tense for 'to be' (am/is/are) is shown using personal suffixes attached directly to the noun or adjective. For the third person (he, she, it, or 'this student'), there is no visible suffix in everyday speech. The 'is' is simply understood from the context!