Learn Finnish: Tuskin olin istunut, kun läikytin kuumaa kahvia. - I had barely sat down when I spilled hot coffee.

This sentence uses a classic narrative structure. The word tuskin (hardly/barely) is paired with the pluperfect tense (olin istunut, had sat) to show the first action was barely completed. Then, kun (when) introduces the immediate next action using the simple past tense (läikytin, spilled).

Why use istunut instead of the verb istuutua (to sit down)?

While istuutua specifically means the action of sitting down and istua means the continuous state of sitting, everyday Finnish often uses istua for both. In this context, olin istunut is a completely natural way to express that you had taken a seat.

Why use läikytin? Are there other verbs for spilling?

Finnish distinguishes between a person spilling something (läikyttää, a transitive verb taking an object) and a liquid spilling on its own (läikkyä, an intransitive verb). Because you are the one doing the spilling in this sentence, you must use the causative verb läikyttää.

Why is kuumaa kahvia in the partitive case?

Coffee is a mass noun, meaning it is an uncountable substance. When an action affects an unspecified amount of a mass noun, the object takes the partitive case. If you wanted to say you spilled the entire cup, you would use the total object form instead, such as läikytin koko kahvin (I spilled the whole coffee).