Genitive + täytyy + Infinitive
Necessive Täytyy
Subject (Genitive) + täytyy + Verb (1st Infinitive)
How It Works
The verb täytyä is used to express strong obligation or necessity. Unlike most Finnish verbs, it follows a specific 'necessive' structure:
- The Subject: The person who has the obligation is in the genitive case (e.g., minun, sinun, Pekan).
- The Verb: The verb täytyy is 'impersonal', meaning it is always in the 3rd person singular. It does not change to täydyn or täydymme, though it can change for tense (täytyi) or mood (täytyisi).
- The Action: The main action follows in the 1st infinitive (the dictionary form) of any verb type.
- The Object: If the sentence has a 'total object' (a whole thing), it usually takes the nominative case (e.g., auto instead of auton). Exception: Personal pronouns (minut, sinut, hänet, meidät, teidät, heidät) and the question word kenet always keep their -t ending.
- Negation: To say you 'don't have to,' use ei tarvitse. In negative sentences, the object must always be in the partitive case.
Examples (5)
- Minun täytyy mennä kotiin.
I must go home.
Word by Word: Of-me must to-go to-home.
The subject 'minä' becomes 'minun' (genitive), and 'mennä' is the basic infinitive form.
- Sinun täytyy ostaa uusi auto.
You must buy a new car.
Word by Word: Of-you must to-buy new car.
Notice that 'auto' is in the nominative case, not 'auton', because it is the object of a necessive 'täytyy' sentence.
- Hänen täytyy nähdä minut.
He/she must see me.
Word by Word: Of-him/her must to-see me.
Personal pronouns like 'minut' are an exception; they keep their accusative -t ending even in necessive sentences.
- Meidän täytyi odottaa bussia.
We had to wait for the bus.
Word by Word: Of-us must-past to-wait bus.
In the past tense, 'täytyy' becomes 'täytyi', but the subject 'meidän' remains in the genitive.
- Sinun ei tarvitse lukea tätä kirjaa.
You don't have to read this book.
Word by Word: Of-you not need to-read this book.
When the necessity is negated using 'ei tarvitse', the object must be in the partitive case.
Common Mistakes
Using a nominative subject (minä, sinä) instead of the genitive (minun, sinun).
Minä täytyy mennä.Minun täytyy mennä.In Finnish necessive constructions, the logical subject must always be in the genitive case.
Using the nominative for personal pronoun objects.
Sinun täytyy tavata minä.Sinun täytyy tavata minut.While nouns take the nominative as objects in these sentences, personal pronouns (minut, sinut, hänet, etc.) must use their special -t ending.
Using the nominative object in a negative sentence.
Sinun ei tarvitse ostaa auto.Sinun ei tarvitse ostaa autoa.When you use 'ei tarvitse' (don't have to), the sentence is negative, which means the object must be in the partitive case.
How It Connects
Learn This First
To use the 'täytyy' pattern, you need to understand how to form the genitive case for the person who 'must' do something, and how to use the basic infinitive form of the verb for the action itself.
- -n (genetiivi)Genitive (-n)
The subject of a necessive 'täytyy' clause must be in the genitive case (e.g., 'minun', 'Annan').
Level 1 - haluta / voida / osata + InfinitiveInfinitive After a Verb
The 'täytyy' pattern requires the main action to be in the first infinitive form (e.g., 'täytyy mennä').
Level 2
Related Patterns
- pitääNecessive Pitää
A very common alternative to 'täytyy', often used in spoken Finnish for the same meaning.
Level 2 - ei tarvitseNot Having to (Ei Tarvitse)
The standard way to negate 'täytyy' (to say you 'don't have to').
Level 2 - Whole Object in the Nominative
Explains why objects in 'täytyy' sentences lose their -n ending.
Level 2 - Consonant Gradation
The genitive subject often triggers consonant gradation (e.g., k-p-t changes).
Level 1
Learn Next
Patterns that build on this one.
Words in This Pattern
Practice Genitive + täytyy + Infinitive in Bubblegum
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