Dative Polysemy

To become proficient in Hungarian, you must understand that -nak/-nek is a structural requirement for many sentence types, not just a translation of English prepositions. As a quick reminder, vowel harmony dictates the choice: use -nak for back-vowel words (e.g., autónak, barátnak) and -nek for front-vowel words (e.g., Péternek, fejemnek).

1. The Indirect Object (Recipient)
The most fundamental use of the dative case is to mark the recipient or beneficiary of an action, especially with verbs of giving, sending, showing, and telling.
Adok egy könyvet Péternek. (I give a book to Peter.)

2. Dative Personal Pronouns
Instead of attaching the suffix to personal pronouns (like "énnek"), Hungarian uses standalone conjugated forms. You will see these constantly: nekem (to/for me), neked (to/for you), neki (to/for him/her/it), nekünk (to/for us), nektek (to/for you all), and nekik (to/for them).

3. The Possessor
Because Hungarian does not have a verb meaning 'to have', possession is expressed using the dative case and the verb van (to be).
Péternek van egy autója. (Peter has a car. / Lit: To Peter is a car-his.)
In advanced syntax, the dative possessor (Péternek az autója) is structurally distinct from the nominative possessor (Péter autója). The dative form allows the possessor to be separated from the possessed noun for emphasis or topicalization: Péternek láttam az autóját. (I saw Peter's car.)

4. Obligation and Permission
When expressing that someone must, may, or can do something using words like kell, szabad, or lehet, the person who has the obligation or permission is marked with the dative case.
Nekem mennem kell. (I have to go.)
Péternek tanulnia kell. (Peter has to study.)
Note: Because the infinitive is already conjugated for person, the dative pronoun is typically dropped in everyday speech (e.g., Mennem kell.) unless used for emphasis.

5. The Experiencer
Many verbs describing physical or emotional states require the person experiencing the state to be in the dative case. These are often called 'psych-verbs'.
Nekem tetszik ez a könyv. (I like this book. / Lit: To me appeals this book.)
Nekem fáj a fejem. (My head hurts. / Lit: To me hurts my head.)

6. Naming and Appointing
A crucial beginner use of the dative case is with the verb hív (to call) to express what someone is named. Additionally, when someone is given a title or role, the role takes the dative case, usually without a definite article.
Péternek hívnak. (My name is Peter. / Lit: They call me Peter.)
Kinevezték igazgatónak. (They appointed him director.)

7. Lexical Government and Beneficiary
Certain verbs inherently require their complement to be in the dative case (e.g., segít 'help', hisz 'believe'). It is also used for the person for whose benefit an action is performed (e.g., Veszek egy ajándékot a barátomnak. 'I am buying a gift for my friend.').

8. Purpose and Perception
The dative is also used to express purpose ('as', 'for') or with verbs of perception and consideration.
Jó lesz vacsorának. (It will be good for dinner.)
Szépnek tűnik. (It seems beautiful.)

Important Distinctions:
Do not confuse the dative with the allative case. The dative is for abstract recipients (giving a book to someone), while the allative is for physical movement (walking to someone).