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