I have to translate the title of my college work and I can't decide whether it is correct to say "Colleagues rating system" or "Colleagues' rating system", because I have often seen examples where genitive/possessive is used without apostrophe or character 's' appended to the noun. Unfortunately I have failed to find any resources for this so as a non-native speaker I must ask for your help!
How it really is? Is it possible to omit apostrophe or s in genitive?
So the answer to initial question is that it depends for genitive (as there is no clear definition of it), right? But what about possessives? Are there situations when it is grammatically correct to use it without apostrophe/'s'?
– user1612250 Feb 27 '16 at 22:38