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