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