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