Hello pals, here i have a little confusion that I haven't been able to clarify. It's as to noun phrases, specifically when they need to contain "of". This is from a book exercise. I have to form noun phrases containig "of" and without "of" from 2 boxes: in one I find: Action, admission, contigency, damage, flow, legal, flow, loss, press, speed. in the other box I find: action, conference, confidence, information, liability, limitation, plan, release, response. the book even gives me 2 examples : 1. action plan 2. admission of liability When should I use "of" in a noun phrase? I need to give an explanation on when to use "of" to form these phrases. Please, help me.