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