Issues are not something that we negotiate. We negotiate treaties, agreements, contracts, terms, and so forth.
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AlpheccaStarsIssues are not something that we negotiate."The prime minister has said it will be an issue to be negotiated after article 50 is triggered." (The Guardian.)
Anonymous"The prime minister has said it will be an issue to be negotiated after article 50 is triggered."He is referring to the various BREXIT agreements.
AlpheccaStarsSo why didn't you put the quote in your original post?Because I can't figure out whether there is any difference in meaning when the two non-finite clauses, passive and active ("an issue to be negotiated" and "an issue to negotiate"), are used in such a context.