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