误He is a Prime Minister of our country.
正He is the Prime Minister of our country.
析the Prime Minister表示“首相”这一职位, the不可用a代替。
一位牧师被召到奄奄一息的病人床边。误Minister has been summoned to the bedside of the dying patient.
正A minister has been summoned to the bedside of the dying patient.
析表示“一位牧师”用a minister,其中a不可省略。