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