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