свою ручку

one's own pen

→ свой
phrase Uncommon #19,175
one's own pen Used when the pen belongs to the subject of the sentence. The form of "свой" changes to match the noun.
RU: Я забыл свою ручку дома.
EN: I forgot my pen at home.

Он достал свою ручку.

He took out his pen.

Том поискал свою ручку.

Tom looked for his pen.

Джим уронил свою ручку и наклонился ее поднять.

Jim dropped his pen and bent down to pick it up.

Он вытащил свою ручку.

He pulled out his pen.