有些名词如attempt,chance,effort,freedom,intention,necessity,opportunity,reason,time,way等,在其后用名词+不定式、名词+介词+ing分词均可,意义无甚差别。
The doctor made a bold attempt to save/at saving the child's life.
Have you any intention to go/of going there?
我的问题:此时名词+介词+ing分词中介词是怎么知道哪个介词?