My father invites his friends to a party.(改为同义句) My father_______ his friends ______ a party.

My father invites his friends to a party.(改为同义句)
My father__calls_____ his friends ___on___ a party.可以解释一下吗？其实这个同义句不太好写 想了半天 觉得只有这个答案了call on 召集 召集朋友到聚会。但是这句子可以这么写：my father‘sfriends isinvitedto a party by him直译：我爸爸的朋友们都被他邀请去参加一个聚会。就是：我爸爸邀请他的朋友们参加一个聚会。