"If you'd like to come in and take a seat...", Polite invitation & hospitality (making a guest comfortable), "If they didn't have relatives nearby, they relied on neighbours.", Past factual reality or regular habit (how things were), "...if we've already secured the preliminary funding.", Prior condition already fulfilled right now, "If the council won't back the scheme, we must find alternatives.", Stubborn refusal & unwillingness (obstinacy), "If it'll expedite the process, we'd be glad to cover the fee.", Negotiation concession / bargaining (offering an incentive), "If you were to encounter any delays, notify us immediately.", Hypothetical condition in formal register, "If you should happen to see him, pass on my regards.", Unlikely possibility / tentative offer

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