Breakdown of Можно проносить все предметы, за исключением оружия.
можно
one may, it is allowed
весь
all, the whole, everything, everyone
оружие
weapon
за исключением
with the exception of
Questions & Answers about Можно проносить все предметы, за исключением оружия.
How does the phrase за исключением affect the noun that follows it?
За исключением is a formal compound preposition meaning 'with the exception of'. It always takes the Genitive case. Here, it forces the neuter noun оружие (weaponry) into its Genitive singular form, оружия.
The translation says 'weapons', so why is оружия in the singular form?
In Russian, оружие is a collective noun. Similar to the English words 'equipment' or 'furniture', it is treated as grammatically singular but refers to the entire category of items in plural terms. You generally do not make it plural.
What specific meaning does the prefix про- add to the verb проносить?
The prefix про- indicates movement 'through' or 'past' a boundary. While the base verb means 'to carry', проносить specifically means 'to carry through' or 'to bring in'—implying you are passing through a security checkpoint or entrance.
Why use the imperfective verb проносить after можно instead of the perfective пронести?
When можно is used to describe a general rule, standing policy, or universal permission, Russian prefers the imperfective aspect. If you were asking for a one-time permission to bring a specific item inside right now, you would use the perfective пронести.