I am in a bad mood now. I wish I weren't in a bad mood now.
They stayed up late. I wish they hadn't stayed up late.
He is not an honest person, so he can't tell the truth. If he were an honest person, he could tell the truth.
You didn't tell me earlier, so we made the wrong decision. If you had told me earlier, we wouldn't have made the wrong decision.
She doesn't cancel the milk, so the milkman keeps delivering it. If she canceled the milk, the milkman wouldn't keep delivering it.