The Year 11 and 12 students that I teach need to have a clear understanding of hexametric scansion. As a result, they need a clear understanding of dactylic hexametre. I have found a few resources along the way that help, including these two videos on Youtube that have been most helpful.
Dactylic Hexameter- Longs and Shorts
Dactylic Hexameter – Proper Metrical Technique