Expressing Obligation: The Genitive Subject
To express that someone must or should do something, Finnish uses a special sentence structure.
- The "doer" of the action (the subject) takes the genitive case (ending in -n).
- The obligation verb is always in the 3rd person singular, regardless of who is acting.
- The main action is in its dictionary form (the 1st infinitive).
Structure: Genitive Subject + 3rd Person Singular Verb + Infinitive
Personal pronouns in the genitive:
- minä → minun
- sinä → sinun
- hän → hänen
- me → meidän
- te → teidän
- he → heidän
The Verb "Pitää" (Must / Have to)
To say that someone must or has to do something, use the verb pitää.
| You have to save money. | Sinun pitää säästää rahaa. |
| We must make a budget today. | Meidän pitää tehdä budjetti tänään. |
This structure is common when discussing everyday tasks and personal finances:
| You have to check the income and expenses today. | Sinun pitää tarkistaa tulot ja menot tänään. |
| He has to transfer the salary to the account. | Hänen pitää siirtää palkka tilille. |
| If you have a debt, you have to pay it back. | Jos sinulla on velka, sinun pitää maksaa se takaisin. |
Giving Advice with "Kannattaa"
To give advice or say what someone should do, use kannattaa (to be worthwhile) with the exact same grammar rules.
| You should pay the debt back quickly. | Sinun kannattaa maksaa velka takaisin nopeasti. |
Obligation sentences are often combined with conjunctions like jos (if) or vaikka (even though). Note that regular clauses follow normal conjugation rules; the genitive structure only applies to the specific clause containing the obligation verb.
| If you want to earn a lot of money, you should invest. | Jos haluat ansaita paljon rahaa, sinun kannattaa sijoittaa. |
| Even though you earn a lot, you should invest. | Vaikka ansaitset paljon, sinun kannattaa sijoittaa. |
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