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