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