A large amount of money is spent on advertisements every year.if this is passive sentence?whether past tense of "spend" is "spent"?

a large amount of large amounts a large amount 与of a large quantity of 区别 a large amount of 与large amounts of的区别 a large amount of的用法 如何使用a large amount of? amount of,a large amount of ,amounts of ,…amount of 英语：大量的是a large amount of还是large amount of? great deal of和a large amount of的用法? a large quantity of等于large quantities of吗还有还有,a large amount of等于large amounts吗 a large amount of the amount ofa large amount of和 the amount of和the number of 的区别说清楚的给最佳 a large amount 和 a great deal of a large amount of只能修饰不可数名词么? a large amount of加可数名词还是不可数名词 a large amount of 可以修饰可数名词吗? What letter is a large amount of water? a large amount of 后接可数还是不可数? a lot a large amount of a large number of得区别 A large amount of money和a large number of money这样用是不是都对?