Breakdown of Tämä on tärkeä ohje: älkää poistuko rakennuksesta.
tämä
this
olla
to be
tärkeä
important
rakennus
the building
älkää
do not (plural/formal)
poistua
to exit
ohje
instruction
Questions & Answers about Tämä on tärkeä ohje: älkää poistuko rakennuksesta.
Why does the verb end in -ko in älkää poistuko?
This is the rule for the plural or formal negative imperative, which means telling a group or a formal contact not to do something. You use älkää (do not) and add -ko or -kö to the verb's stem. For the verb poistua (to exit), the stem is poistu-, and vowel harmony gives us -ko.
How would this command look if I were speaking informally to just one person?
You would say älä poistu. For the singular informal 'don't', you use the word älä and just the plain verb stem, dropping the -ko ending entirely.
Why do we use the -sta ending on rakennuksesta?
The verb poistua means to exit or to leave from somewhere. In Finnish, when you exit from the inside of a place, you use the elative case (-sta or -stä), which translates to 'out of'.
What happens to the base word rakennus (building) when we add the -sta ending?
Finnish words ending in -us change that ending to -ukse- before you attach most case endings. That is why the base word rakennus changes to its stem rakennukse- before adding -sta to become rakennuksesta.
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