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