Imagine telling a friend: "If I had time, I would travel with you." This is a hypothetical sentence — it talks about something unreal or uncertain, not a fact. In German, this kind of sentence needs a special form called Konjunktiv II, which is completely different from the simple present tense you learned at A1 and A2.
Why do we need this form? Because German draws a sharp line between what is real ("I travel") and what is hypothetical, wished-for, or polite ("if I traveled," "I would like to travel," "could you travel with me"). Many languages signal this shift only through context or a single helper word; German instead marks it clearly through the verb form itself.
In practice, Konjunktiv II covers three main situations: first, wishes — expressing a desire for something that isn't currently true ("I wish I were there"); second, polite requests — asking for something tactfully instead of giving a direct command ("could you help me" instead of "help me"); and third, unreal conditions — a sentence starting with wenn that describes a situation that isn't actually happening ("if I had money, I would buy a house").
Structurally, the golden rule is simple: most German verbs don't use their own dedicated Konjunktiv II form in everyday speech, so we rely on the helper verb würde plus the main verb in its infinitive at the end of the sentence. But a handful of very common verbs — especially sein and haben, and the modal verbs können, müssen, dürfen, and sollen — have their own short forms that you should simply memorize: wäre, hätte, könnte, müsste, dürfte, sollte. These are shorter and more natural than würde with them, so German speakers prefer them at every level.
One important point about word order: if the sentence begins with wenn, the conjugated verb moves to the end of that clause, while in the main clause that follows, the verb comes immediately after the comma — just like in other conditional sentences you already know.
The most common mistake learners make is using würde with sein and haben instead of their dedicated forms, producing something like "Ich würde Zeit haben" instead of the correct and far more natural "Ich hätte Zeit." Remember: with sein, haben, and most modal verbs, use the dedicated form directly — you never need würde with them.