I want to show my students how intonation contours in Praat can help identify English interrogatives. An obvious example is "He's coming." vs "He's coming?" -- but perhaps those of you more familiar with prosody or intonation have better ideas in mind.
It is often helpful to avoid voiceless sounds as much as possible in prosody stimuli, to get a clearer pitch track. For example, "Mary will win" has no voiceless sounds (from: Pierrehumbert, J. (2000). Tonal elements and their alignment. In Prosody: Theory and experiment (pp. 11-36). Springer Netherlands.).
For demonstration purposes, you may also want to use a longer sentence.