介词后面+动词格式的问题

题目

介词后面+动词格式的问题
今天读到一句话.
Fluoride has been banned for use in AC units,lessening the ozone layer's depletion.
以前的经验看到介词 FOR 后面肯定+ using .问一下英语达人,为什么这样写?
Lucy has completed courses of studying in ABC college.
(or)Lucy has completed courses of study in ABC college.

答案

Fluoride has been banned for using in AC units,lessening the ozone layer's depletion.
这句话当然不成立.
理由是现在分词的逻辑主语应该与句子主语保持一致.Fluoride只能是被使用于...中,而不是使用于...中
所以应该用现在分词被动形式
Fluoride has been banned for being used in AC units,lessening the ozone layer's depletion.
而这也不正确,因为ban的用法是加from而不是for来表示禁止做某事,这样就得改为
Fluoride has been banned from being used in AC units,lessening the ozone layer's depletion.
这样一来整个句子就显拖拉了.
而使用use的名词形式就不存在这些条条框框.
Fluoride has been banned for use in AC units,lessening the ozone layer's depletion.
use in AC units 在空调设备中的使用,in AC units 介词短语作use的后置定语
以上是我的理解,大家探讨一下
Lucy has completed courses of studying in ABC college.
(or)Lucy has completed courses of study in ABC college.
两个都对