Verbs ending in a consonant followed by -y change the -y to -ied in the past tense form.
Substantially is regular. It follows the -ied Conversion rule.
Use past time markers: "Yesterday, she substantiallied to the store."
No. Use "did not substantially" (not "did not substantiallied").
The verb substantially follows the standard English past tense conjugation rule. When forming the past tense, substantially becomes substantiallied. This follows the -ied Conversion pattern, which is one of the most common conjugation rules in English.
Understanding why substantially becomes substantiallied helps with spelling and pronunciation. Verbs ending in a consonant followed by -y change the -y to -ied in the past tense form.
When using substantiallied 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 substantiallied to the store." The past tense form does not change based on the subject — I substantiallied, you substantiallied, he/she substantiallied, we substantiallied, they substantiallied.