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