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