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Questions & Answers about Cijenimo njegov prijedlog.
Since prijedlog is the object, why doesn't the possessive njegov take an accusative ending like njegovog?
Because prijedlog (suggestion) is a masculine inanimate noun (a thing, not a person or animal). In Croatian, masculine inanimate nouns and their possessive words look exactly the same in the accusative case as they do in the nominative (dictionary) form. If the object were a living thing, you would use njegovog.
Why doesn't the noun prijedlog itself change its ending?
For the exact same reason! Masculine nouns that represent non-living things don't change their endings in the accusative case. They stay identical to their base nominative form.
How would the sentence change if we were appreciating her suggestion instead of his?
You would say Cijenimo njezin prijedlog (or njen prijedlog). The word for 'her' changes to match the new owner, but it still takes the masculine inanimate accusative form because it must agree with the masculine noun prijedlog.
Where is the word for 'we' in this sentence?
It is built into the verb! The -mo ending on cijenimo tells us that 'we' are the ones appreciating. You can say Mi cijenimo njegov prijedlog, but native speakers usually drop the mi unless they want to add special emphasis.