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