"Nach der Schule wären wir erfahren."
I have a question about the meanings of "wären": It's clear that "wären" is used in the meaning of conditional. But couldn't we use this with the meaning of past subjunctive? for example if we say "If I were king.....". Couldn't we say that in german like this "wenn ich ein König wäre...."?
Yes. "wären" and its various forms (ich wäre, du wärst, er wäre, wir wären, ihr wärt, sie wären) is the past subjunctive of "sein".
Understood. So we can use it in both ways (in conditional and past subjunctive)?
Yes, but in conditional you can only use it when it stands on its own. If there's another verb, you would use "würde", e.g. "ich würde es haben". (ich würde, du würdest, er würde, wir würden, ihr würdet, sie würden)
is that so...that only the subjunctives of "sein" and "haben" can be used in conditional when standing on their own?
Thanks man. You helped me. Now I understand much of it (turns out, we can use the subjunctive form of all verbs in the meaning of conditional. But because that form of most verbs doesn't differ from präteritum, we use mostly those, that differ from präteritum, while forming the others with würden). I wonder if the same is in expressing the subjunctive mode (i.e. we have some auxillary verbs for those verbs that have the identical form with präteritum). But anyway, I thank you very much. Spasibo.