"Somewhat different from their central use is the use of questions for the purpose of seeking clarification on a preceding utterance. Although both polar interrog- atives and constituent interrogatives easily lend themselves to this purpose, echoing something previously uttered in the form of a question often precludes the use of the standard interrogative constructions and necessitates a more indi- rect way of asking questions." (König & Siemund 2007: 318)