What is the past tense of undo?
The past tense of undo is undid, and the past participle is undone.
Undo is an irregular (strong) verb: the vowel changes instead of adding -ed.
All forms of undo
as a verb
- base
- undo
- past tense
- undid
- past participle
- undone
- present participle
- undoing
- third-person singular
- undoes