of 、for、 to 、with的區(qū)別與用法
例如（1）the government should further strengthen the supervision and control of the production and circulation of plastic bags.其中的control of the procduction為什么不能用to呢.（2）I am writing to ask if you can recommend a child as the recipient of my financial assistance.其中的的writing to ask 可以換做writing for asking （3）thank you very much for having given me this opportunity to take such a promisiong position in such a best-selling magazine.其中的thank you very much fo having give 可以換做to having give 還有with,這幾個詞我老是分不清楚,不知道什么時候該用哪一個,希望有人能幫幫我 還有那個可數(shù)名詞,是不是前面不加冠詞之類的都要用復數(shù)?