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