This verb follows the standard English past tense rule: simply add -ed to the base form.
Undersign is regular. It follows the Standard -ed rule.
Use past time markers: "Yesterday, she undersigned to the store."
No. Use "did not undersign" (not "did not undersigned").
The verb undersign follows the standard English past tense conjugation rule. When forming the past tense, undersign becomes undersigned. This follows the Standard -ed pattern, which is one of the most common conjugation rules in English.
Understanding why undersign becomes undersigned helps with spelling and pronunciation. This verb follows the standard English past tense rule: simply add -ed to the base form.
When using undersigned 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 undersigned to the store." The past tense form does not change based on the subject — I undersigned, you undersigned, he/she undersigned, we undersigned, they undersigned.