Irregular Verbs

In English, regular verbs in the Past Simple Tense and the Past Participle are formed by:

     adding +ed or +d to the base form of the verb

Verbs that have a different form are considered irregular verbs. English has hundreds of irregular verbs. Some of the most common ones are listed below.

See also: 
Past Simple Tense
Past Participles

irregular verbs 1
irregular verbs 2
irregular verbs 3
irregular verbs 4

When a verb is irregular, other forms of the verb stem with prefixes or suffixes, will also be irregular:
do – done – did  
undo – undone – undid
redo – redone – redid

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