his/her/their left hand
Tom tenía la llave de su auto en su mano izquierda.
Tom had his car key in his left hand.
Tim escribe con su mano izquierda.
Tim writes with his left hand.
Un accidente automovilístico le privó del uso de su mano izquierda.
A car accident deprived him of the use of his left hand.
Él atrapó la pelota con su mano izquierda.
He caught the ball with his left hand.
Él se lastimó su mano izquierda.
He hurt his left hand.
Él giró el pomo de la puerta con su mano izquierda.
He turned the doorknob with his left hand.