German phrase
Was schreibe ich, wenn ich ~ habe?
Meaning
What should I write if I have ___?
When to use it
It asks what to write. Use it to explain an absence or change of plans.
Example dialogue
Was schreibe ich, wenn ich einen Termin habe?
What should I write if I have an appointment?
Dann schreib kurz, wann der Termin ist und dass du deshalb nicht kommen kannst.
Then briefly write when the appointment is and that you cannot come because of it.