Digraph ff at end of word off puff cuff huff l lap let luck lot log lock lip leg lid ll at end of word hill bell fill fell doll tell ill well ss at end of word fuss boss hiss kiss less loss mess miss f if fun fog fan of fat fed compound words padlock catnap fusspot backpack cannot sunset 2 syllables sunset begun rabbit thunder pocket. The first place to start is letter sounds.

Phonics Worksheets For First Graders Third Grade Phonics Worksheets
Of course this starts with toddlers and preschoolers but if you teach learners in k who dont know their letter sounds this is your starting point.