Whole Object in the Genitive

In an affirmative clause with an ordinary personal verb, a singular total noun object usually takes the genitive ending -n. The action is presented as bounded and the quantity as a whole; some verbs and constructions require another object case. This is often called the 'n-accusative' in older textbooks.

1. Morphology and Adjectives:
Add -n to the singular stem. Note that adding this ending closes the syllable, which selects the weak grade in ordinary direct-gradation words such as kukka; other noun types have different stem patterns. For example: kukka (flower) becomes kukan. Any adjectives describing the object must also take the -n ending: Ostan uuden auton (I will buy a new car).

2. Singular vs. Plural:
The -n ending is only used for singular total objects. If the object is plural and the action is completed, you must use the nominative plural (-t) instead: Ostan kirjat (I will buy the books).

3. Pronouns and Question Words:
Personal pronouns do not use the -n ending. Instead, they have a unique total-object form ending in -t (minut, sinut, hänet, meidät, teidät, heidät, as well as the interrogative pronoun kenet). Unlike nouns, pronouns keep this -t ending even in 'special frames' like imperatives or passive sentences. However, the inanimate question word mikä (what) takes the genitive form minkä as a total object (e.g., Minkä kirjan ostat? - Which book will you buy?).

4. Aspect and Future Tense:
Object case marks boundedness and quantity, not grammatical tense. A bounded event in the present tense often receives a future interpretation from context.

• Luen kirjaa (partitive): I am reading the book (ongoing).
• Luen kirjan (genitive): I will read the book (to the end).

5. Mass Nouns (Uncountables):
Using the genitive total object with mass nouns changes the meaning from a general substance to a specific, bounded portion. For example, Juon kahvia means 'I am drinking coffee' (general), but Juon kahvin means 'I will drink the cup of coffee' (a specific portion).

6. When NOT to use -n:
Even if the action is completed, the -n is dropped in specific 'special frames'. In these cases, you use the nominative total object instead. These frames include:

• 1st and 2nd person imperatives (commands): Osta kirja! (Buy the book!) or Ostakaa kirja! (Buy the book, plural!). Note that 3rd person imperatives still keep the -n.
• Passive sentences: Kirja ostetaan. (The book is bought.)
• Impersonal constructions (where the verb is in the infinitive and there is no nominative subject, such as necessive sentences): Minun täytyy ostaa kirja. (I must buy the book.)

The governing construction can also affect objects of nested infinitives. In Minun täytyy ostaa auto, minun is a genitive actor, not a nominative subject, and auto is nominative. This is a rule of necessive and comparable constructions, not a rule triggered merely by omitting a pronoun: Ostan auton retains -n even without minä. For example, Mene ostamaan auto! (Go buy a car!) drops the -n because the main verb is an imperative.

7. The Negation Rule:
An object within the scope of ordinary clause negation takes the partitive: En ostanut autoa. Special contrastive or metalinguistic negation needs separate analysis; do not mechanically change every noun anywhere in a sentence containing ei. However, if the negative meaning is conveyed by an abessive infinitive (e.g., Jätin ostamatta auton - I left the car unbought), the object takes the genitive because the main verb is affirmative.

8. Partitive Verbs and Numerals:
Verbs such as rakastaa, odottaa, and etsiä ordinarily take a partitive object in their basic uses; bounded result constructions can behave differently. Additionally, numbers other than yksi (one) require the partitive singular for the noun following them, so they do not take the genitive -n ending.