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