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