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Questions & Answers about Der Plan muss genau sein.
Why is Der Plan using der instead of den?
Because Der Plan is the subject of the sentence and therefore in the nominative case. Der is the masculine nominative article. Den would be the masculine accusative.
Why doesn’t genau take any adjective ending (like –e or –en)?
Here genau is a predicate adjective (it follows the linking verb sein), not an attributive adjective before a noun. Predicate adjectives remain uninflected in German.
Why is sein placed at the end of the sentence?
In German, when you use a modal verb like müssen, the conjugated modal (muss) goes in the second position, and the main verb (here sein) appears in the infinitive at the very end.
Why isn’t there a zu before sein, as in “muss zu sein”?
With modal verbs (müssen, können, dürfen, sollen, wollen, mögen), you do not use zu before the main infinitive. The zu‐infinitive appears only with other constructions, not with true modals.
Can I swap genau for a synonym? If so, how?
Yes. You could say Der Plan muss präzise sein, Der Plan muss exakt sein or Der Plan muss detailliert sein, depending on the nuance you want.
What case is Plan in, and why isn’t there an object in this sentence?
Plan is in the nominative case because it’s the subject. The verb müssen here is intransitive when used with a predicate adjective—there is no direct object.
How would you express this sentence in the past or future tense?
Past (Präteritum): Der Plan musste genau sein.
Future (Futur I): Der Plan wird genau sein müssen.
What’s the difference between müssen and sollen in a sentence like this?
Müssen expresses a necessity or obligation (stronger).
Sollen expresses a recommendation, duty, or expectation (weaker).
E.g.
- Der Plan muss genau sein. (It absolutely has to be exact.)
- Der Plan soll genau sein. (The plan is supposed/recommended to be exact.)