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