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