The students want to------- We use the elevator to go up and down the tall buildings.
问题描述：
The students want to------- We use the elevator to go up and down the tall buildings.
为什么student加s,而elevator不加s.
答
student一般都用作集体名词.都要加-s. elevator这里特指电梯.我们需要用电梯上下高层建筑也许是乘很多电梯上下楼啊如果加-s，那应该加一个语境，例如我们去了特定的地方，然后搭乘了很多电梯