Usage Note
Sin triggers the infinitive in verbal complements where English uses a gerund: salió sin decir nada 'she left without saying anything'. The negative compound sin que introduces a subjunctive clause: hazlo sin que nadie te vea 'do it without anyone seeing you'. Sin embargo 'however / nevertheless' is one of the most frequent discourse connectors in formal writing.
Examples
"Salió sin su abrigo."
Natural Translation
She went out without her coat.

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