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