Hi there, I'm just starting out learning Russian but I like to be as precise as possible when I can and the book I'm using is leaving a few things out.
First of all, when using "с" with the instrumental, when do I change it to "со"? The book says "in front of some words beginning with consonant clusters" but doesn't get any better than that. Which consonant clusters require the added о? Or is there no reliable rule?
Secondly, I know that predicate nouns take the instrumental whenever the past and future of быть is used, but when do predicate ADJECTIVES take the instrumental? My book again just says "sometimes."
Thanks!
PS: My Russian is not nearly good enough to understand any replies in Russian... sorry.
Edit: and one more. when exactly are you supposed to add н before third person pronouns that are the objects of preopositions? My book isn't really clear on it but it sort of hints that you do it when they're declined. Is that right?