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