Verbs ending in a consonant followed by -y change the -y to -ied in the past tense form.
Casualty is regular. It follows the -ied Conversion rule.
Use past time markers: "Yesterday, she casualtied to the store."
No. Use "did not casualty" (not "did not casualtied").
The verb casualty follows the standard English past tense conjugation rule. When forming the past tense, casualty becomes casualtied. This follows the -ied Conversion pattern, which is one of the most common conjugation rules in English.
Understanding why casualty becomes casualtied helps with spelling and pronunciation. Verbs ending in a consonant followed by -y change the -y to -ied in the past tense form.
When using casualtied 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 casualtied to the store." The past tense form does not change based on the subject — I casualtied, you casualtied, he/she casualtied, we casualtied, they casualtied.