worth前的名词为什么不用所有格
下面这句话中 worth 是名词用法吗？为什么前面的 days 不需要写成“所有格”？
例句一：The metal lunch box craze lasted until the mid-1980s, when plastic took over. Two theories exist as to why. The first—and most likely—is that plastic had simply become cheaper. The second theory—possibly an urban myth—is that concerned parents in several states proposed bans on metal lunch boxes, claiming kids were using them as “weapons” to hit one another. There's a lot on the internet about a state-wide ban in Florida, but a few days worth of digging by a historian at the Florida State Historical Society found no such legislation. Either way, the metal lunch box was out.——《大学英语等级考试》
下面这句话也是：
例句二： I gave him sixpence yesterday and advised him to save it. Instead, he bought himself sixpence worth of trouble. ——《新概念英语》
不是说这种情况要用下面这种用法吗？
名词's worth of +名词（为名词用法，意思价值为...的某物）
I went and bought about six dollars' worth of potato chips.
最佳答案 2021-09-06 09:11
1 《韦氏高阶》、《牛津》等词典认为这个结构要用属格名词。例如：
He bought 40 dollars' worth of gas. 韦氏
She has 15 years' worth of experience in advertising. 韦氏
The winner will receive fifty pounds' worth of books. 牛津
2 柯林斯词典则给出二种用法，即属格形式和连字符形式。例如：
I went and bought about six dollars' worth of potato chips.
The prepaid sim card gives you ten euros-worth of calls.
You've got three years' worth of research money to do what you want with.
The film is his own compilation of more than 50 hours-worth of footage.
3 WR网站中母语为英语的老外们对此观点不一，有人虽然赞同用属格形式，但认为这种用法正在消失，更多的人现在直接用复数名词修饰worth，不用属格。https://forum.wordreference.com/threads/four-million-dollars-worth-of-equipment.619426/
4 从网友的这篇文章以及《新概念英语》中不用属格，可以知道现在直接用复数名词修饰worth而不用属格，已经是很常见的现象了。
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