The document discusses the classification of verbs as regular or irregular based on how they form their past tense. Regular verbs follow a consistent pattern of adding "-d" or "-ed" to form the past tense, while irregular verbs have varying patterns such as changing vowels, consonants, or making no changes. It provides examples of regular and irregular verbs. It also outlines the four principal parts of a verb - present, past, present participle, and past participle - and provides a table practicing forming verbs in their various forms.

2. The way a verb forms its past tense determines its classification as regular or irregular. A regular verb takes the –d or –ed ending to denote the past tense.

3. Irregular verbs do not take the –d or –ed ending. They are inflected in various other ways to indicate past tense.

4. Regular believe -> believed smile -> smiled Irregular run -> ran eat -> ate

5. An irregular verb forms its past and past participle by changing vowels ( run-- ran ) or consonants ( build– built) or by changing vowels and consonants ( catch – caught ) or by making no changes ( burst, cost )

6. Every verb has four basic parts, which are called its principal parts. You must know all of these in order to form the different tenses correctly. Present (aka Infinitive) Past Present Participle Past Participle

7. existing or happening now know to know take to take write to write

8. existed or happened in the past knew took wrote

9. The present participle of a verb always ends in –ing . knowing taking writing

10. The past participle of a verb always requires a helping verb ( have, has, had ). had known have taken has written

11. Present Past Past Participle begin 1. ___ _ ______ have begun freeze 2. ___ _ ______ have frozen write wrote 3. _____ _ ___ blow 4. __ _ _______ have blown drive drove 5. ___ ___ ___ wear wore 6. _____ ____ sing 7. __________ have sung ride 8. __________ have ridden

12. Present Past Past Participle begin 1. have begun freeze 2. have frozen write wrote 3. blow 4. have blown drive drove 5. wear wore 6. sing 7. have sung ride 8. have ridden

13. Present Past Past Participle choose chose 9. _________ go 10. _________ have gone run 11. _________ have run throw threw 12. ________ come came 13. ________ see saw 14. ________ speak 15. _________ have spoken burst 16. _________ have burst

14. Present Past Past Participle choose chose 9. go 10. have gone run 11. have run throw threw 12. come came 13. see saw 14. speak 15. have spoken burst 16. have burst

15. Present Past Past Participle swim swam 17. ________ sink sank 18. ________ break 19. _________ have broken bring 20. _________ have brought

16. Present Past Past Participle swim swam 17. sink sank 18. break 19. have broken bring 20. have brought