The parcel was full of stones and sand!请问：sand是可数的,为什么没用sands?
问题描述：
The parcel was full of stones and sand!请问：sand是可数的,为什么没用sands?
答
sand做“沙子”意思时是不可数的,用复数的时候sands是“沙滩”的意思,此时谓语动词也要随之变化