Questions & Answers about Pitkän työpäivän jälkeen selkää särkee, jos en venyttele.
Because of jälkeen.
In Finnish, the postposition jälkeen (after) always takes the genitive case:
- pitkä työpäivä → pitkän työpäivän jälkeen = after a long workday
- kokous → kokouksen jälkeen = after the meeting
Both the adjective (pitkä) and the noun (työpäivä) have to agree in case, so they both go into genitive: pitkän työpäivän.
Selkää is the partitive form of selkä (back), and this is the normal pattern with pain/ache verbs in Finnish.
Expressions like:
- Päätä särkee. – My head aches.
- Selkää särkee. – My back aches.
use the partitive to show an ongoing, not clearly bounded state (the ache isn’t a single, complete event). This is similar to how the partitive is used for “incomplete” or “unbounded” actions and quantities.
Using nominative selkä here (Selkä särkee) would sound odd; native speakers naturally say selkää särkee.