An if clause introduces a condition. It has to be a conditional. The sentence is correct as it stands.
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AnonymousThank you, Mr. CalifJim. I have one doubt, though. If they didn't ... would be. If they don't ... will be/is.I thought that's how it worked.Oh, yes, that's definitely how it works, but there are exceptional cases like this one. Here the expected "is" is weakened by substituting "would" in a situation where advice is given. It makes the advice seem