An irregular verb has an "irregular" inflection. Whereas a regular verb just adds -ed or -d to form the past tense and the past participle tense, an irregular verb varies in forming these two tenses. There are some possibilities: 1) The three forms (infinitive-past tense-past participle tense) are the same: cut-cut-cut 2) The past and past participle tenses are different from the infinitive tense, but alike between them: buy-bought-bought 3) The three forms are different: take-took-taken.
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