Breakdown of Мы отправили предупреждение, так что возврат сделать нельзя.
мы
we
сделать
to do (perfective) / to make (perfective)
отправить
to send (perfective)
нельзя
one must not
так что
so / with the result that (conjunction)
возврат
refund / return
предупреждение
warning
Questions & Answers about Мы отправили предупреждение, так что возврат сделать нельзя.
Can I use поэтому instead of так что in this sentence?
Yes, they are very similar here. так что (so / with the result that) is slightly more conversational and emphasizes a direct, factual consequence flowing naturally from the first clause. поэтому (therefore / that's why) sounds just a bit more formal and treats the two statements as slightly more independent. Also, remember that так что is preceded by a comma but never split by one.
Why is сделать in the perfective aspect after нельзя?
The aspect you use with нельзя changes its meaning entirely, which is a common trap! нельзя + imperfective verb means "it is forbidden / you must not." нельзя + perfective verb (like сделать here) means "it is impossible / it cannot be done." Here, making a refund isn't just prohibited; the system or situation makes it procedurally impossible because the warning was already sent.
Why is the object возврат placed before the verb in возврат сделать нельзя?
Russian word order uses placement to show what is the known topic vs. the new information. By putting возврат (the refund) first, it links back to the context of the warning—"as for the refund, it can't be done." The standard order нельзя сделать возврат would also be grammatically correct, but it would sound slightly more abrupt and put the heavy emphasis at the very end on the word "refund".
Is возврат the subject of the second clause?
No, the second clause is an impersonal construction (it has no grammatical subject). возврат is actually the direct object of the infinitive сделать, which means it is in the accusative case. Because возврат is a masculine inanimate noun, its accusative form looks exactly like its nominative form.
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