This is the 525th most frequent Czech word.
hasiči
Firefighters.
In this sentence, 'hasiči' is used in the nominative plural form, representing the subject of the sentence (firefighters who are performing the action).
Hasiči rychle dorazili na místo požáru.
The firefighters quickly arrived at the scene of the fire.
Here, 'hasiči' is in the instrumental plural form, indicating that the actions are being performed alongside or with the firefighters.
Mluvili jsme s hasiči o bezpečnostních opatřeních.
We talked to the firefighters about safety measures.
'Hasiče' in this sentence is in the accusative plural form, used as the object of the preposition 'for', referring to who the vehicle belongs to.