просторијама

In a sentence

• Састанак ће се одржати у нашим просторијама.

  The meeting will be held in our premises.

  The word 'просторијама' is used here in the locative case, referring to specific physical spaces where the meeting will occur.

• У просторијама школе одржавају се разни курсеви.

  Various courses are held in the school's premises.

  In this sentence, 'просторијама' again appears in the locative case, associated with the location within the school.

• Морамо очистити све просторије пре вечерашњег догађаја.

  We need to clean all the rooms before tonight's event.

  'Просторије' is used here in the accusative case to indicate the spaces that are the object of the action, but it relates to the same term representing rooms or spaces.