Nouns Possession

girl’s dress

Girl is singular, so we add '’s' to show it belongs to one girl. So it's 'girl’s dress'.

The boy’s bat is red.

The apostrophe in 'boy’s' shows that the bat belongs to the boy.

fox’s tail

Fox is singular, so we add '’s' to show possession. So it's 'fox’s tail'.

This is my father’s car.

Father is singular, so we use '’s' to show possession. 'Father’s car' means the car belongs to the father.