Forgetting the Genitive Before a Postposition

An English preposition takes a bare noun: "in front of the house," "under the table." A Finnish postposition comes after the noun — that's what "post-position" means — and, crucially, it demands that the noun wear the genitive ending -n: talo*n edessä ("in front of the house"), pöydä**n alla ("under the table"). English gives you no habit of marking the noun, so the single most common postposition error is leaving it bare: *talo edessä instead of talon edessä. This page drills the -n back in. For the full list of which words govern the genitive, see the genitive trap.

The default: noun + -n + postposition

The overwhelming majority of Finnish postpositions govern the genitive. The shape is fixed: [noun]-n + [postposition]. Get the -n onto the noun and you are right most of the time.

Watch the consonant gradation hiding in the genitive

The genitive -n does more than add a letter — it very often triggers consonant gradation, weakening a consonant in the stem. So the noun you memorized in its dictionary form changes shape, and forgetting that is a second layer of the same mistake.

If the gradation still feels unpredictable, that is normal at this stage — learn the genitive form of each noun as a unit (pöytä → pöydän, silta → sillan, kauppa → kaupan) rather than trying to compute it live.

Pronouns + kanssa: genitive and a possessive suffix

"With" is kanssa, and it is the postposition beginners get most wrong, because with a pronoun it wants two things at once: the pronoun in the genitive and a matching possessive suffix on kanssa itself. So "with me" is minu*n kanssani*, not minä kanssa.

With an ordinary noun, though, there is no suffix — kanssa simply takes the genitive noun:

The pronoun-plus-suffix pattern (minun kanssani, sinun kanssasi, hänen kanssaan, meidän kanssamme, teidän kanssanne, heidän kanssaan) is worth memorizing as a set — see kanssa for the full paradigm.

The exception: a few postpositions want the partitive

The genitive is the safe default, but a small group governs the partitive instead. Two of them — ennen ("before") and ilman ("without") — even sit in front of the noun like English prepositions, yet they still demand a case: the partitive, not the genitive.

These are the exception, not the rule. Learn the handful of partitive-governing words as a special list and default everything else to the genitive.

Why English speakers get this wrong

In English, a preposition never touches the shape of its noun — "under the table," "with me," "in front of the house" all leave the noun exactly as the dictionary has it. So there is no reflex to build on when you switch to Finnish, where the postposition reaches back and changes the noun it governs. The English word order compounds the problem: your ear expects the relational word before the noun, so when Finnish puts alla or edessä after it, the noun in front feels finished and bare, and the missing -n doesn't announce itself. The fix is to treat any postposition as a signal to look leftward and check the noun: is it wearing the genitive -n? Bind the two together in memory as a single chunk — talon edessä, pöydän alla, minun kanssani — so the postposition and its case travel as one unit. For the systematic breakdown of which words take which case, work through the genitive trap and the wider postpositions overview.

Key Takeaways

• A Finnish postposition comes after the noun and almost always demands the genitive -n: talon edessä, pöydän alla.
• The genitive frequently triggers gradation: silta → sillan, kauppa → kaupan, sänky → sängyn — learn the genitive form as part of the noun.
• kanssa with a pronoun wants both the genitive pronoun and a possessive suffix: minun kanssani, not minä kanssa; with a noun it's just the genitive: ystävän kanssa.
• A small set governs the partitive instead — notably ennen (ennen kuutta) and ilman (ilman sinua) — and these two even precede the noun.
• When you see a postposition, look left and check the case; store the pair as one chunk.