Learn Turkish: Affedersiniz, giriş neresi? - Excuse me, where is the entrance?

Neresi literally means "what place" and is used when you are identifying a place itself. You are asking which specific part of the building is the entrance. Nerede means "at what place" and is used when locating an object or person. When identifying rooms, doors, or specific areas within a structure, neresi is the most natural choice.

How does the word neresi break down grammatically here?

It combines the root nere (what place) with the third-person possessive suffix -si. This allows it to act as a full noun meaning "the identity of the place". Because it functions as a noun, it can easily act as the subject or direct object of your sentence.

Why isn't there a verb for "is" at the end of this question?

In Turkish, the "to be" verb for "is" or "are" is typically represented by a suffix like -dir or -tir. However, in everyday speech and simple questions like this, that suffix is almost always dropped. The phrase giriş neresi? is perfectly complete on its own.

How is the noun giriş formed?