Other
Oxford Dictionaries: Verb Tenses: Adding Ed and Ing
Spelling rules and word lists for adding -ed and -ing endings to verbs.
Dave's ESL Cafe
Dave's Esl Cafe: Verb Forms and Verb Tenses #6: Spelling Ing Forms
Spelling rules and examples for adding the "ing" suffix to the ends of words.
Patsy Stevens
Garden of Praise: The 1 1 1 Spelling Rule
Sheet music for a song about when to double the final consonant before adding suffixes.
ClassFlow
Class Flow: Add Ed and Ing Endings to Verb
[Free Registration/Login Required] This flipchart introduces rules for correct spelling of verbs ending in -ed and -ing. There is a wonderful interactive activity and Activote assessment.