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