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