Breakdown of Me pidämme tästä toimistosta, koska se on siivottu.
tämä
this
olla
to be
se
it / he / she (of a person) / that
me
we
Questions & Answers about Me pidämme tästä toimistosta, koska se on siivottu.
Why is the perfect passive here formed with on siivottu instead of a passive form of the verb to be?
The perfect passive affirmative is always built using the active third-person singular verb on (is) plus the passive past participle of the main verb. For the verb siivota (to clean), the participle is siivottu. So, on siivottu translates to has been cleaned. You never use the passive verb form ollaan to build this specific tense.
How exactly do we get the form siivottu from the basic verb siivota?
The word siivota (to clean) is a Type 4 verb. To form the passive past participle for verbs ending in -ta or -tä, you simply replace the final -a or -ä with -tu or -ty. Therefore, siivota changes to siivottu.
Why do we say tästä toimistosta with the -sta ending instead of just tämä toimisto?
The verb pitää (to like) always requires the thing you like to be in the elative case, which ends in -sta or -stä. Because toimisto (office) becomes toimistosta, the demonstrative pronoun tämä (this) must also match that case, becoming tästä.
Does the pronoun se in the second clause refer back to the whole first half of the sentence?