stank / stunk
The past and the past participle of stink.
The past of stink is stank. The past participle is stunk, after forms of have and forms of be: The hall stank. The hall has stunk. The hall was stunk out. Do not use The hall stunk for the simple past.
Examples
Use The crate stank of oil.
Use The crate has stunk for a week.
Avoid The crate stunk of oil.