Breakdown of Он должен поторопиться, а то поезд уйдёт.
он
he / it (for a masculine noun) / it (for a neuter noun)
поезд
train
должен
must, have to
уйти
to leave (on foot, pf) / to retreat into solitude
поторопиться
to hurry up
а то
otherwise
Questions & Answers about Он должен поторопиться, а то поезд уйдёт.
Does а то mean the exact same thing as иначе (otherwise) here?
They are very similar, but а то specifically carries the tone of a warning or a threat ("or else"). It is highly colloquial and is the standard choice in everyday conversation to introduce a negative consequence. иначе is a bit more neutral and can be used in formal writing as well.
The lesson also mentions не то. Could I swap а то for не то in this sentence?
Absolutely. You could say Он должен поторопиться, не то поезд уйдёт and it means exactly the same thing. Both а то and не то act as fixed conjunctions meaning "or else" and are interchangeable when warning someone about a bad outcome.
Why do we use уйдёт (will leave on foot) instead of a vehicle verb like уедет for the train?
This is a common, tricky exception! While you use уехать when you leave by train, Russian uses the "on foot" verbs (идти, уйти, подойти) for the scheduled movements of large public transport like trains, buses, trams, and ships. To a Russian speaker, the train simply "walks away": поезд уйдёт.
Why is the infinitive поторопиться perfective? Doesn't должен sometimes take an imperfective verb?
должен can take either aspect depending on context. Here, we use the perfective поторопиться because it's a specific, single action that needs to be completed right now to meet a deadline. If you used the imperfective торопиться, it would mean he generally has to "be in a hurry" as a habit, which doesn't fit the immediate threat of missing a train.
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