two thousand为什么不加S而two months加S急呀……快好的还回加悬赏的

two thousand of为什么thousand不加s two thousand为什么不加S而two months加S急呀……快好的还回加悬赏的 为什么two-year-old的year不加S而two-hundred-words的word要加S three hundred pounds 为什么加S four thousand people 为什么不加Sthree hundred pounds 为什么加S four thousand people 为什么不加S million thousand 的后面为什么不加S请问million thousand 2 million 2thousand后面为什么都不加s?有没有加s的时候? two thousand中thousand加s吗?一定要准确,谢谢,请说出理由 Several_______new books were sold out last week.若答案是thousand of有什么错一楼二楼的同志，two thousand也是不加S的三楼，数词+thousand/hundred/......+of是“这些书中的几千本的意思 our teacher asked us to write a __articleA.two-thousand-word B.two-thousand-wordC.two-thousands-words D.two-thousand-words答案选C 但我记得有一道题的答案选three-year-old boy 为什么本题的thousand要加S呢 请给出详细解 two shoe stores为什么shoe不加s 为什么parent不加''s''而grandparents要加''s''? 为什么单数加s而复数不加s 为什么单数加s而复数不加s 为什么是tens?并且后面要加of?thousand也能加of?thousand为什么加s? 2011用英语除了读为“TWO THOUSAND --EVELEN”还可读到“TWENTY ELEVEN”吗?THOUSAND要不要加S? he has a three-legged table he worte a two-thousand-word report 同是名词leg加ed为什么word不加? It will take you ages to read that __ book .B) two-thousand-page D) two thousand pages A和C肯定不对就不再多写了,可没明白为什么D不对,two thousand 后面是不能加s吧?为什么pages不对?这个意思就是说表示数字的话 read为什么只加S而不加es. two,three,four,five,six,seven,eight,nine thousand后面要不要加s