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
wir
we
das Treffen
the meeting
müssen
to have to, must
denn
because
absagen
to cancel
dringend
urgent / urgently
die Geschäftsreise
the business trip
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?
denn is a coordinating conjunction, meaning it occupies "position 0" and connects two independent clauses without changing their word order. The conjugated verb habe stays safely in position 2. If the sentence had used weil instead, the word order would be forced to change.
Why does the sentence use the verb machen for a business trip instead of a verb that means "go"?
While in English you "go on" a trip, German treats it differently. The standard German expression is to "make" a trip: eine Reise machen (or in this case, eine Geschäftsreise machen).
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