Let's say it's idiomatic, and quite common. By "idiomatic," I mean it's something well-spoken people would say. Can we escape the "conditional" concern by substituting "since"?
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English 1b3 Another response said that this is what is called the 'unnamed conditional.' In other words, not all if clauses can be classified as one of the conditionals.Those pesky namers sure persist, don't they?