Definition
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someone
A person not identified or specified.
A person not identified or specified.
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Someone left their umbrella in the cafe.
Alguien dejó su paraguas en el café.
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I heard someone singing in the park yesterday.
Escuché a alguien cantando en el parque ayer.
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Someone must have knocked on the door while I was out.
Alguien debió haber llamado a la puerta mientras yo estaba fuera.