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