Some irregular verbs, like let, shut, and spread, never change, whether present or past. They form the simple past tense and the past participle in any number of unpredictable ways. A regular verb's simple past tense and past participle are always identical. We call a verb regular when we add ed ( want ed, look ed) or sometimes just d ( create d, love d) to form what are called the simple past tense and the past participle (see third and fourth paragraphs below).
English verbs are either regular or irregular.
