several tons of amber were used to make it为什么用复数

three million tons of rubbish 谓语用单数还是复数 it used to make me very upset It used to be the home of the Muslim Moors ,who were in char thousands of tons of rubbish 作主语时谓语动词用单数还是复数 请问 tons of it 怎么翻译? though it were ten thousand mile 这个句子为什么用复数were,mile为什么也用复数呢 though it were ten thousand mile 这个句子为什么用复数were,mile为什么不用复数呢 2800 tons of paper 作主语,谓语用单数还是复数 The way he did it was different_____we were used to It is careless of you make such a mistake,为什么用to,那意思是什么 Three million tons of coal was/were exported three tons of coal was/were exported 哪个对