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