However the irregular form snuck has become quite common, especially in American English. **** The verb sneak was used in its regular form for a long time. Exercises and explanations relating to ‘Irregular verbs in perfect tenses’. The past participle and conjugation of irregular verbs in the present perfect and past perfect tenses do not follow the standard rules and require memorization. In English grammar, irregular past participles and conjugations can cause confusion for language learners. *** The following verbs use the standard past and participle forms (-ed) in American English. « all exercises Irregular Past Participles. ** The verb lie in the meaning of not to tell the truth is a regular verb. Exercise - Past simple: mixed exercise 4 Lesson 4: Past simple form with irregular verbs (2:58) Exercise - Past simple with irregular verbs positive 1. Note: The words can, may and must are Modals. The following English irregular verbs are often used in the standard past and participle forms (-ed). We do not foresee all the irregular verbs ever being standardized, but some of the more minor variations in less commonly used words will probably disappear in the next genration or two. The trend, in English, and especially in American English, is to standardize the irregular verbs. For more information about irregular verbs, including lists you can download and interactive exercises, please have a look at:. Elementary School High school Higher Education/University Education Adult Education English ESOL Irregular verbs Past simple. The irregular verbs in a table infinitive Irregular Verbs Part 1 Pre-intermediate Find the match.