Breakdown of Вы должны отойти от края платформы!
вы
you (plural)
должен
must, have to (должен, должна, должны)
от
from
платформа
platform
отойти
to step away / depart (pf)
край
edge
Questions & Answers about Вы должны отойти от края платформы!
Why do we see от twice in this sentence (отойти от)?
In Russian, verbs of motion often pair a prefix with a matching preposition to reinforce the direction. The prefix от- in отойти means 'moving away,' and it is naturally followed by the preposition от (meaning 'from') to introduce the specific starting point you are moving away from.
Why does the verb start with ото- instead of just от-?
The prefix is fundamentally от-, but an extra о is added as a 'fill vowel' to make pronunciation easier before certain sounds. When combining от- with the root for walking on foot, it becomes отойти rather than the unpronounceable 'отйти'.
Why use the perfective verb отойти here instead of the imperfective отходить?
The perfective aspect is used because the speaker is demanding a single, immediate, and completed result. You need to step away right now and achieve the result of being away from the edge, rather than performing a repeated or continuous action.
Why are both края and платформы in the Genitive case here?
They are Genitive for two completely different reasons! The word края (from край, edge) is Genitive because it directly follows the preposition от. The word платформы (from платформа) is Genitive to express 'of the platform,' linking it to the edge.
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