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