Everyone knows that unfortunately most common English verbs have irregular forms for the simple past and past participle. Regular verbs are easy ... you just add an "ed" to the end of the base word to make the simple past. For example, "I walked yesterday" or "He tried hard to learn English." But what about words like come, go, and say? These are common irregular verbs.
Back in the day, people used to make flashcards on index cards to learn stuff like this, but now we have fun tools on the internet. Here's a set of virtual flashcards I (with the help of my daughter) made to help you learn your irregular verbs. On the front of the flashcard is the simple form of the verb. On the back is the simple past and past participle. You use the past participle with words like have, has, and had ... such as "He has gone to the zoo."