The key to exercise solutions in chapter 12B - He's been everywhere! for the textbook English File Elementary - Student's Book with authors Christina Latham-Koenig, Clive Oxenden and Jerry Lambert from Oxford University Press
Question
Write the infinitives for the irregular verbs. Then listen and check.
Now look at some verbs where the past participle is different from the past simple. Write the infinitive and the past simple. Then listen and check.
Underline the verbs that have the same form for the past simple and the past participle.