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