Der Rekordversuch hätte besser geplant werden müssen.

Questions & Answers about Der Rekordversuch hätte besser geplant werden müssen.

Why does the sentence end with the infinitive müssen instead of the past participle gemusst?
This is due to the "double infinitive" rule. When a modal verb is used in a perfect or past subjunctive tense, and it is attached to another verb (in this case, the passive phrase geplant werden), the modal verb takes its infinitive form instead of its past participle. So, it becomes müssen instead of gemusst.
What is the rule for the order of the three verbs at the end: geplant werden müssen?
In a standard main clause, the conjugated auxiliary (hätte) sits in the second position. The remaining verbs stack at the end in this specific order: Main Verb Past Participle (geplant) + Passive Auxiliary Infinitive (werden) + Modal Infinitive (müssen). A helpful trick is to read them backwards: müssen (had to) werden (be) geplant (planned).
The English translation says "should have been planned", but doesn't müssen mean "must"? Why not use sollen?
You absolutely can use sollen here (...hätte besser geplant werden sollen), which translates literally to "should have been". However, German speakers often use hätte... müssen ("would have had to be") to express a strong missed obligation in the past. English translators usually smooth this out to "should have been" because "would have had to be" can sound clunky.
Why is it Der Rekordversuch (nominative) if the attempt is the thing being acted upon?
Because this is a passive sentence. In an active sentence, someone is planning the attempt, making it the direct object in the accusative case (for example: Man hätte den Rekordversuch besser planen müssen). When you switch to the passive voice, that direct object gets promoted to the subject of the sentence, which must be in the nominative case (Der).

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