an amount of 后接可数还是不可数

加可数名词

a great deal of 非常多的，大量的；跟不可数名词She has given me a great deal of help.
a great many后面跟可数名词复数
a good many很多的，相当多的；跟可数名词A good many workers were for the bill.
plenty of(没有a)充足的，相当多的；跟可数、不可数名词都可。We have plenty of time./We have plenty of books on the shelf.
a variety of 修饰不可数名词
a large amount of+cn(pl)
a great deal of+un
a large number of 加可数名词的复数
much of 加不可数名词
lots of 可以加不可数名词也可以加可数名词复数

Part of speech and defination不可以修饰可数名词。例子：a fair amount of 大量 a great amount of 大量 a incalculable amount of 不计其数的 a large amount of 大量 a limited amount of 极少数; 极少量 a moderate amount of 适量 a small amount of 少量 a substantial amount of 大量 a suitable amount of 适量 a vast amount of 大量 accumulated amount of 1 每元的复利终值; 每元复利本利和; 每元复利本利和 additional amount of water 附加水量 allotted amount of payment 支出分配数 amount of 1 每元本利和 amount of a annuity 养老金额; 年金金额 amount of absolute moisture 绝对水分含量 amount of bank 坡度 amount of bleeding 出血量 a