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