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