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