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