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