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