Wir haben den Flashmob geplant, weil wir die Leute überraschen wollten.

Questions & Answers about Wir haben den Flashmob geplant, weil wir die Leute überraschen wollten.

Why use the Perfekt tense in the first half (haben geplant) but the Präteritum tense in the second half (wollten)?
This mixed-tense pattern is standard in everyday German. Most verbs are used in the Perfekt tense for the past (haben geplant). However, modal verbs like wollen are almost always used in the Präteritum (wollten) instead. Trying to use the Perfekt for a modal verb often requires a clunky double infinitive construction (haben überraschen wollen), which native speakers naturally avoid.
Why is wollten at the very end of the sentence, after the infinitive überraschen?
The word weil is a subordinating conjunction, meaning it kicks the conjugated verb to the very end of its clause. In a normal main clause, you would say wir wollten die Leute überraschen (conjugated verb first, infinitive last). But because of weil, the conjugated wollten gets pushed to the absolute end, landing right after the infinitive überraschen.
Flashmob is an English loanword. How do we know it needs the masculine accusative article den?
English loanwords in German are assigned genders based on various rules, often taking the gender of their closest German equivalent or root. The word der Mob (the mob/crowd) is masculine in German, so der Flashmob is also masculine. Because the flash mob is the direct object that is being planned, it takes the accusative form den.
Since this lesson is about nur dass, how would I attach a nur dass (except that) exception to the end of this thought?
You would add a comma after wollten and start a new clause. Because nur dass is a subordinating conjunction, it also sends its conjugated verb to the end of the new clause. For example, you could add: ..., nur dass niemand gekommen ist (...except that nobody came).

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