Video library Skip to Videos All | Assimilated Prefixes | Grade 1 to Grade 3 | Grade 4 to Grade 6 | Grade 7 and up | Word Study In Practice | High Frequency Words | Suffixing Convention: Replace "e" | Suffixing Convention: Doubling | Suffixing convention "y" toggles to "i" | Grade 1 to Grade 3, Assimilated Prefixes, Grade 7 and up, Grade 4 to Grade 6, Assimilated Prefixes Concept: This video explores how default prefixes can change their spelling based on the spelling of the element following it.