Breakdown of Sie war wütend, weil sie das Geld überweisen musste.
sein
to be
sie
she
das Geld
the money
müssen
to have to, must
Questions & Answers about Sie war wütend, weil sie das Geld überweisen musste.
Why are there two verbs at the end of the sentence (überweisen musste), and why is musste last?
Because weil (because) introduces a subordinate clause, the conjugated verb (musste) gets pushed to the very end of the sentence. The main verb (überweisen) stays in its infinitive form and is placed just before the conjugated modal verb, exactly as it would appear at the end of a regular main clause.
I sometimes see this spelled as müsste with an umlaut. Why is it musste here?
Musste (no umlaut) is the simple past tense (Präteritum) meaning 'had to'. If it had an umlaut (müsste), it would be the subjunctive II (Konjunktiv II), which means 'would have to' or 'ought to'. Since she actually did have to transfer the money in reality, we use the factual past tense musste.
Is the prefix über- in überweisen separable?
No. While über- can be a separable prefix for some verbs, in überweisen (to transfer money) it is inseparable. If you used it in a normal main clause, you would say Sie überweist das Geld (She transfers the money), without splitting the prefix off.
This lesson is about using wollen to express a claim. How would I change the weil clause to say '...because she claims to have transferred the money'?