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