Common Verbs:
* Keep
* Kick
* Kill
* Kiss
* Know
Less Common Verbs:
* Kneel
* Knit
* Knell
* Knock
* Know (past tense - knew)
* Kindle
* Kink
* Knave (archaic, to act as a knave)
* Kowtow
Specialized Verbs:
* Ketchup (to add ketchup to food)
* Kayak (to paddle a kayak)
* Kidnap
* Kite (to fly a kite)
Informal Verbs:
* Kaboom (to make a loud exploding sound)
* Kook (to act strangely)
Let me know if you'd like more examples, or if you have a specific context in mind!