This verb follows the consonant-vowel-consonant (CVC) pattern. The final consonant is doubled before adding -ed to maintain the short vowel sound.
Underrun is regular. It follows the Consonant Doubling rule.
Use past time markers: "Yesterday, she underrunned to the store."
No. Use "did not underrun" (not "did not underrunned").
The verb underrun follows the standard English past tense conjugation rule. When forming the past tense, underrun becomes underrunned. This follows the Consonant Doubling pattern, which is one of the most common conjugation rules in English.
Understanding why underrun becomes underrunned helps with spelling and pronunciation. This verb follows the consonant-vowel-consonant (CVC) pattern. The final consonant is doubled before adding -ed to maintain the short vowel sound.
When using underrunned 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 underrunned to the store." The past tense form does not change based on the subject — I underrunned, you underrunned, he/she underrunned, we underrunned, they underrunned.