Надо пере вести все предложения в пассивный залорг, 1.they sell milk in this shop. 2.they broke the window last week. 3.we shall do the work in the evening. 4.they haven't brought back my skates. 5.he will introduce me to his friends. 6.they are building a bridge over the river
2the window was broken by them last
week
3the work will be done by us in the evening
4my skates haven't been brought. back by them
5I shall be introduced to his friends by him
6a bridge over the river is being built