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