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