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