useful one前用an还是a

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• All but one相关的语法请问,all but one后面不用介词、直接加名词的话,名词应该用单数还是复数呢?比如:All but one child are living together;All but one children are living together.这两句话哪句才是正确的呢?究竟应该是all来修饰后面的名词,还是one来修饰呢?后面的谓语的数我是知道的,不论如何,都是复数.关键就是前半部分.如果是all来修饰名词,那么这句话的主语中心词就是children,但如果是one来修饰,那么all就会是中心词,作名词用.请各位不吝赐教,在此先谢过了!非常感谢各位的及时回答，其实这句话的难点我想了一下，应该是all和one本身的词性就具有名词和形容词两种，导致后面直接接名词会不知道其该从属于哪一个修饰语。谓语动词的数大可不用提了，复数是必然的。只是名词的数有点难搞。
• 英语中“八年前”用eight year ago 还是ago eight year?
• “一年前”翻译成英语应该是a yearr ago 还是one year ago?一月前呢
• 年龄段前用什么词修饰,between还是among?
• keep sb at a distance from sb/sth 用法正确吗?还是keep at a distance with 用正确的用法造句 前者是教辅里面的 后者是百度的 我不知哪个正确keep one's distance 也造句
• 用酵母菌酿酒的主要阶段为：加料→接种→通气培养→密封发酵.从接种后到密封前这一阶段,酵母菌种群数量变化的曲线为J型还是S型?
• 英语啊 一篇初二的填空(用适当的形式填空）（ask,think,grow,begin,have,go,walk,rain,turn,get)One day ,a little boy and his father_①_out after supper.While they_②_a walk in the park,it suddenly _③_to rain .they didn't have raincoats,so they _④_very wet.the little boy felt unhappy.While they _⑤_home in the rain ,the boy thought of something.Then he _⑥_to his father and _⑦_,"why does it rain?Do you think it is nice?""It isn't nice,I think,but it's useful."answered his father "
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• 英语语法：saturdayafternoon前用in还是on
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• I AM NO LONGER THE MAN WHAT I WAS的勉句子结构分析I AM NO LONGER THE MAN WHAT I WAS和I AM NO LONGER THE MAN THAT I WAS 这两个句子是不是都正确,如果正确那么WHAT 和THAT各引导什么丛句,可否省略?二都用法有什么差别,