but for some reason it could not be used then.请问use在句中是use+ed的形式吗?如何翻译这个词?

but for some reason it could not be used then.but for some reason请问在句中作什么成份? 课文中有but for some reason..reason不是可数名词吗? but for some reason it could not be used then 这里的then是为了接下句吗还是怎么回事 for some reason 的用法正确吗?新概念第二册Lesson21的课文上有这样一句话:The airport was built years ago,but for some reason it could not be used then.很奇怪for some reason的用法,reason不是可数名词吗,为什么不加s, matthew___to an important position,but he gave it up for some reason.为什么用could have been promoted .而不用should have been promoted. The airport was built during the war,but for some reason it could not be used then.后面是不是then,为加它,不加行不行? but for some reason it could not be used then.请问use在句中是use+ed的形式吗?如何翻译这个词? for some reason造4个句子要求有翻译 ___ Mr Green called u just now but he didn't tell me his full name for __ reason.A Some ; since aB A ; for someC A certain ; because of aD The ; because of some wThe airport was built years agoyearsyears ago前为什么不加数量单位或“few”一类的词它后面紧跟but for some reason it could not be used then，想问问：for some reason 是省略的说法吗？ “There must be some reason for it”中的“for it”有什么用? 英语翻译and return to the place where i don't want to stay(for some reason).I can forget all of these,but please treat me fairly.Now i don't know how on earth serious the society is But for some reason it could not be used then.last year,however ,it came into use.这句话里能不能把then后面的句号写在then前面?为什么? It was reported on TV that the famous clock has been_______,but it still refuses to work for some unknown reason.A wounded up B winded upCwinding up Dwound up _____some reason ,he didn`t attend the meeting ,but we don`t know the reason _____his being absentA.For ,forB.For ,ofC.Of,ofD.Of,for+原因! Some people think that we humans should not keep animals for any reason. 请翻译：for some reason i want you and i don't know why The Game ever stopped for some reason.这句话怎么理解.