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