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