This verb follows the standard English past tense rule: simply add -ed to the base form.
Sour is regular. It follows the Standard -ed rule.
Use past time markers: "Yesterday, she soured to the store."
No. Use "did not sour" (not "did not soured").
The verb sour follows the standard English past tense conjugation rule. When forming the past tense, sour becomes soured. This follows the Standard -ed pattern, which is one of the most common conjugation rules in English.
Understanding why sour becomes soured helps with spelling and pronunciation. This verb follows the standard English past tense rule: simply add -ed to the base form.
When using soured 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 soured to the store." The past tense form does not change based on the subject — I soured, you soured, he/she soured, we soured, they soured.