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