For instance if I need a ride because my car is in the shop, we usually set up a return favor like babysitting or doing their grocery shopping for them.

例如，如果我需要一辆自行车，因为我的车还摆在商店里（估计是无力购买的意思，译者按），我通常会还以报答的关心，如看孩子或帮他们购买食品杂货。