“a amount of”这个词组中,amount不是元音开头吗?为什么前面用a?

“a amount of”这个词组中,amount不是元音开头吗?为什么前面用a? 请问a certain amount of 这个词组的准确意思 词组 a good many / a good numberof / a great amount of / a great deal of 的区别、用法词组：a good many a good number of a great amount of a great deal of以上四个词组的区别是什么? 我平常在书中只看到a huge amount of和 huge amounts of的区别,不知道有没有the huge amount of这个词组,请大家帮忙,谢谢 a good amount of造句 a good amount of 中amount可以用good修饰然后解释为 许多 a amount of和the amount of的谓语动词 是a amount of还是an amount of amount of,a large amount of ,amounts of ,…amount of 有a plenty of这个词组吗 英语词组辨析a large amount of a great deal ofa large quantity of这3个词组用法有什么区别,尽量详细些, 今天我看见词汇手册里面有个词组a small amount of printed words不是amount只修饰不可数名词么怎么还能修饰可数名词? 关于多少的几个词和与这些词相关的词组的用法amount,deal,number,sum,quantity,a large number of,amount of,a great number of ,a large sum of ,等等 英语翻译a big amount of money a large amount of large amounts a large amount of的用法 如何使用a large amount of? a great amount of的意思