This verb follows the standard English past tense rule: simply add -ed to the base form.
Undo is regular. It follows the Standard -ed rule.
Use past time markers: "Yesterday, she undoed to the store."
No. Use "did not undo" (not "did not undoed").
The verb undo follows the standard English past tense conjugation rule. When forming the past tense, undo becomes undoed. This follows the Standard -ed pattern, which is one of the most common conjugation rules in English.
Understanding why undo becomes undoed helps with spelling and pronunciation. This verb follows the standard English past tense rule: simply add -ed to the base form.
When using undoed in writing, remember that it functions as a past tense verb and typically appears with time markers like yesterday, last week, or ago. For example: "Yesterday, she undoed to the store." The past tense form does not change based on the subject — I undoed, you undoed, he/she undoed, we undoed, they undoed.