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