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свой портфель

one’s own briefcase

→ свой
phrase Rare #43,747
one’s own briefcase Свой refers to something belonging to the subject of the sentence; портфель can also mean a schoolbag.
RU: Она взяла свой портфель.
EN: She took her own briefcase.

Я забыл свой портфель.

I forgot my briefcase.

Том закрыл свой портфель и ушел.

Tom closed his briefcase and left.

Том схватил свой портфель и направился к двери.

Tom grabbed his briefcase and headed for the door.

Том потерял свой портфель.

Tom lost his briefcase.

Я потерял свой портфель.

I lost my briefcase.