The document classifies irregular verbs into 7 sections based on how their forms change between the present, past, and past participle tenses. Section 1 contains verbs that have totally different pronunciations and spellings for past and past participle forms. Sections 2 through 7 contain verbs that change in predictable ways, such as not changing at all, having the same past and past participle forms, changing vowels, ending in "ought" or "aught", ending in "t", or ending in "n" or "en". Exercises are listed at the end.