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