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