Look at the sentence:
—> That’s the actor who was a pilot in Star Wars. The relative pronoun is the subject so we cannot omit it. I know that we can omit the relative pronoun if it’s the object.
My question is : Why can the relative pronoun be omitted from these following sentences ?
1) —> My brother, who is a former professional hokey player, coaches elite high school hockey. becomes: —> My brother, a former professional hokey player, coaches elite high school hockey.
2) —> Teachers who work online have flexible schedules. becomes: —> Teachers working online have flexible schedules.
3) —> The man that was bitten by the dog went to hospital. becomes: —> The man bitten by the dog went to hospital.