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