Breakdown of Было настолько холодно, что мы вернулись.
мы
we
быть
to be
что
that (conjunction)
холодно
cold (adverb)
вернуться
to return (pf)
настолько
so much, to such an extent
Questions & Answers about Было настолько холодно, что мы вернулись.
Why doesn't this sentence use чтобы like the other sentences in this lesson?
The current lesson focuses on phrases like 'too cold to go out' (слишком холодно, чтобы...), where the second action is an unrealized potential result. Here, the result is an actual fact that happened: it was so cold that we went back. For a realized fact, you use что with a normal conjugated verb (мы вернулись), rather than чтобы with an infinitive.
Could I say так холодно instead of настолько холодно here?
Yes, they are mostly interchangeable in this context. Настолько emphasizes the degree or extent of the cold ('to such an extent'), while так is simply 'so'. Both pair perfectly with что to introduce the result.
Why is the neuter form Было used here?
In Russian, general states, weather, and environmental conditions are expressed impersonally. You use the neuter past tense было alongside an adverb like холодно without any subject. You never use a literal translation of the English dummy subject 'it'.
Why is вернулись in the perfective aspect?
The perfective aspect is used because going back was a single, completed action triggered by the cold. If you used the imperfective возвращались, it would mean 'we were on our way back' or 'we repeatedly went back', which changes the meaning of this one-time cause-and-effect event.
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