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