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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? - разделительный

Is 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 подлежащему

Why is the father proud of his sons at achievements? - специальный