The different types of irregular verbs

forms the same way.

For example, the words “watch” and “catch” only differ in their first letters. Since the past tense of “watch” is “watched”, a lot of people mistakenly add an “ed” to “catch” to form its past tense, “catched”. This doesn’t work because “watch” is a regular verb, while “catch” is an irregular verb whose past tense and past participle form is “caught”.