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