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