Unregular verbs and Irregular verbs

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Sometimes people use term ‘Unregular’ verbs although the term ‘Irregular’ verbs is correct.

But the term “unregular” exists and means “not regular”. See Wiki or Lexico.

Opposite for the term “Irregular verb” is “Regular verb”.

regular verb is any verb whose conjugation follows the typical pattern, or one of the typical patterns, of the language to which it belongs. A verb whose conjugation follows a different pattern is called an irregular verb. (This is one instance of the distinction between regular and irregular inflection, which can also apply to other word classes, such as nouns and adjectives.)

Use of irregular verbs in English

Each verb (either regular or irregular) has three basic forms:

  • infinitive (the base form)
  • the past form
  • past participle

Regular verbs take the -ed ending, which is identical both for the past form and past participle, and that’s it.

Unlike regular verbs, English irregular verbs are a different story. This is where it starts to get tricky and you simply have to memorize them.

An example of an English regular verb:

  • Infinitive: cook
  • Past simple: cooked
  • Past participle: cooked

An example of an English irregular verb:

  • Infinitive: be (present simple is / am / are)
  • Past simple: was / were
  • Past participle: been

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