Breakdown of Wir haben das Treffen absagen müssen, denn ich habe dringend eine Geschäftsreise machen müssen.
ich
I
ein
a, an (eine)
machen
to make, to do
haben
to have
Questions & Answers about Wir haben das Treffen absagen müssen, denn ich habe dringend eine Geschäftsreise machen müssen.
Why does the sentence use müssen at the end of both clauses instead of the past participle gemusst?
This is the double infinitive rule in action! When a modal verb (like müssen) is used together with another verb in the Perfekt tense, we do not use its past participle (gemusst). Instead, we use its infinitive form, resulting in two infinitives at the end of the clause: absagen müssen and machen müssen.
How do I know which infinitive goes last in the double infinitive construction?
The modal verb always comes dead last in a standard main clause. You put the main action verb (absagen or machen) first, followed immediately by the modal verb (müssen).
The verb absagen has a separable prefix. Why isn't it separated here?
Separable verbs only split when they are the active, conjugated verb in the sentence (usually sitting in position 2). Because this sentence is in the Perfekt tense, the helping verb haben takes the conjugation, and absagen remains in its full, unseparated infinitive form.
The word denn means "because". Why doesn't it push the conjugated verb (habe) to the very end of the sentence?