应该是：
We hope (we're going to join) the farewell party.
我们希望参加这个告诉派对.
will = be going tothe twins invited us to have dinner together 对to have dinner together 提问���,Ӧ���ǣ�What did the twins invite us to do? ~~~~~~~~~~����~~~~~~~~ף���������а����뼰ʱ����~~~~~~~~~~~~~~~~~~~~~~~~