This verb follows the standard English past tense rule: simply add -ed to the base form.
Derail is regular. It follows the Standard -ed rule.
Use past time markers: "Yesterday, she derailed to the store."
No. Use "did not derail" (not "did not derailed").
The verb derail follows the standard English past tense conjugation rule. When forming the past tense, derail becomes derailed. This follows the Standard -ed pattern, which is one of the most common conjugation rules in English.
Understanding why derail becomes derailed helps with spelling and pronunciation. This verb follows the standard English past tense rule: simply add -ed to the base form.
When using derailed 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 derailed to the store." The past tense form does not change based on the subject — I derailed, you derailed, he/she derailed, we derailed, they derailed.