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The father is proud of his sons at achievements. 

The father is proud of his sons at achievements, isn't he? - разделительныйIs the father proud of his sons at achievements? - общий  Is the father proud of his sons or daughters at achievements? - альтернативный Who is proud of his sons at achievements? - специальный к подлежащемуWhy is the father proud of his sons at achievements? - специальный