son devoir

his duty

→ son
phrase Common #8,905
his duty Can also mean “her duty” or “their duty,” depending on context. In the plural, devoirs often means homework.
FR: Elle pense qu’elle a fait son devoir.
EN: She thinks she has done her duty.

Tom a accompli son devoir.

Tom has done his duty.

Mais elle a accompli son devoir.

But she did her duty.

— Shower (1999)

Même si c'est son devoir.

Even if it’s their duty.

— Léviathan (2014)

Yanni écrit son devoir.

Yanni writes his homework.

Mon oncle remplissait son devoir, et les villageois, le leur.

My uncle was doing his duty, and the villagers, theirs.

— Dangal (2016)

Il a été bien au-delà de son devoir.

He went above and beyond the call of duty.

Il a senti que c'était son devoir de partir.

He felt it was his duty to leave.

Il sentit que c'était son devoir d'y aller.

He felt that it was his duty to go.

Avant de mourir, il veut aller au bout de son devoir.

Before dying, he wants to fulfill his duty to the end.

— Le Maître d'armes (2006)

Il accomplit son devoir.

He does his duty.

On vous en a donné lecture, chacun fera son devoir.

You have been given the text to read, everyone will do their duty.

— Guerre et Paix (1968)

Khan, Kirk ne faisait que son devoir.

Khan, Kirk was just doing his duty.

— Star Trek II : La colère de Khan (1982)

Il venait de finir son devoir lorsque dix heures sonnèrent.

He had just finished his homework when ten o'clock struck.

Il a fait son devoir.

He did his duty.

Elle s'efforça de faire son devoir.

She made an effort to do her homework.

Il a senti que c'était son devoir d'y aller.

He felt that it was his duty to go.

N'était-ce pas son devoir ?

Wasn't it his duty?

— Lagaan (2001)