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