Three melodies: fall, rise, level
Once the individual sounds are right, what still marks a learner is the melody of the whole sentence. Learners keep their native melody for years, because nobody corrects it: a German listener notices that something is off without being able to say what.
English uses rises freely to sound friendly, tentative or open. German saves the rise for a few jobs and ends most sentences with a clear fall to the bottom of the voice. The same melody therefore means different things: an English-style rise on a German statement sounds unsure, as if you were asking permission.
The contours, once each
Ich komme morgen um acht.
[Ich komme morgen um ACHT ↘]
I'm coming at eight tomorrow.
statement: the voice lands at the bottom
Mach das Fenster zu!
[Mach das Fenster ZU ↘]
Close the window!
command: a hard fall
Kommst du morgen um acht?
[Kommst du morgen um ACHT ↗]
Are you coming at eight tomorrow?
yes-no question: the rise
Wenn ich Zeit habe, komme ich vorbei.
[Wenn ich ZEIT habe → komme ich vorBEI ↘]
If I have time, I'll come round.
level before the comma, fall at the end
Ich brauche Brot, Milch und Eier.
[Ich brauche BROT ↗ MILCH ↗ und EIer ↘]
I need bread, milk and eggs.
a small rise on each item, a fall on the last
The W-question trap
In English a W-question can fall or rise, and a friendly rise (Where are you from?) is what many speakers reach for when meeting someone. In German a W-question normally falls, and it does not sound unfriendly while doing so: the warmth comes from the words and the face. A final rise adds a meaning on top: I did not catch that or really?
Falling against rising: the same words
Woher kommen Sie?
[Woher kommen Sie? ↘]
Where are you from?
normal, neutral, entirely polite
Woher kommen Sie?
[Woher kommen Sie? ↗]
Where are you from, sorry?
rising: you are asking someone to repeat, or you are surprised
Was hast du gesagt?
[Was hast du gesagt? ↘]
What did you say?
an ordinary question
Was hast du gesagt?
[Was hast du gesagt? ↗]
You said WHAT?
rising: disbelief, and in the wrong situation a challenge
Wie bitte?
[Wie bitte? ↗]
Sorry, what?
here the rise is right: this really is a request to repeat
Melody of a contrast
When you reject one thing and name another with nicht … sondern, the two halves get opposite melodies: the rejected item is accented and the voice rises (or stays up), and the replacement is accented and the voice falls. Without that pattern the correction does not register.
nicht … sondern
Ich komme nicht am Montag, sondern am Dienstag.
[nicht am MONtag ↗ sondern am DIENStag ↘]
I'm not coming on Monday, but on Tuesday.
Er ist nicht krank, sondern müde.
[nicht KRANK ↗ sondern MÜde ↘]
He isn't ill, he's tired.
Politeness is grammar, not melody
English speakers often add a rise to be polite. German does not need it: the politeness is already in Könnten Sie, Ich hätte gern and bitte. If you add an English rise on top of a statement or an imperative, the request sounds unsure instead of polite. A yes-no question rises as usual.
Polite requests, said the German way
Könnten Sie mir bitte helfen?
[Könnten Sie mir bitte HELfen? ↗]
Could you help me, please?
a yes-no question, so the rise is correct here
Ich hätte gern einen Kaffee.
[Ich hätte gern einen KafFEE ↘]
I'd like a coffee.
a statement: falling, and still perfectly polite
Sagen Sie mir bitte Bescheid.
[Sagen Sie mir bitte beSCHEID ↘]
Please let me know.
an imperative falls; bitte does the softening