Other
Oxford Dictionaries: Verb Tenses: Adding Ed and Ing
Spelling rules and word lists for adding -ed and -ing endings to verbs.
ClassFlow
Class Flow: Adding Ing to Verbs
[Free Registration/Login Required] This flipchart discusses how the spelling of verbs changes when ing is added.
Other
Eclectic English: The Present Continuous Tense the Ing Form of Verbs
Learn how to correctly add the -ing ending to various types of words, and then practice by adding -ing to twenty-two 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.
ClassFlow
Class Flow: Inflected Endings
[Free Registration/Login Required] This flipchart is designed for students to practice adding -s, -ed, and -ing to words.