...tons of amber were used...

题目

...tons of amber were used...
...thousand tons of amber were used to make it.
请问为什么这里要用were,而不用was呢?

答案

thousand tons of是上千吨的 是复数 虽然amber不可数 但这里的were是修饰tons的 所以用were
比如 paper不可数 但是说pieces of paper就可以数了