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