Your school lessons are correct. The past perfect "had known" is a proper use of the subjunctive mood. However, in colloquial and informal English, the subjunctive has been slowly disappearing over many years.
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tinanam0102I'm going back to the office because I have a client coming in late.
tinanam0102If I knew you were going out, I wouldn't have cooked all these.I have no statistical evidence for it, but this substitution seems to be much more common with stative verbs, especially to be.
tinanam0102I think I'm getting there. But you wouldn't say: If we "got" on the bus, we would have been killed in the accident. Instead, "had gotten" would be used.I can't promise you that in the heat of a real conversation I absolutely would not say: If we got on the bus, we would have been killed in the accident. But most likely I would not say it
tinanam0102I think I have it wrong.Hmm. Why do you say that? You seem to have it right.
tinanam0102Does this stative verb include verbs like "see, hear, like, want, feel, love"?Yes, but they can sometimes be used in a way where they are not clearly stative, as in sudden perceptions: