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