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