Simple Sentences:
* She vowed to never give up on her dreams.
* He vowed revenge after the injustice he suffered.
* The couple vowed to love and cherish each other forever.
More Complex Sentences:
* The politician vowed to fight for the people, but his actions spoke otherwise.
* After years of struggle, the athlete vowed to make a comeback and prove his doubters wrong.
* Despite the danger, the firefighter vowed to rescue everyone trapped inside the burning building.
Sentences with Different Meanings:
* The witness vowed to tell the truth, no matter the consequences. (To promise solemnly)
* The ancient king vowed to sacrifice his own son to appease the gods. (To promise to do something religious or superstitious)
* The rebel army vowed to overthrow the tyrant and establish a free state. (To promise to do something challenging or dangerous)
Remember, "vowed" usually implies a strong commitment to an action or belief. It's a powerful word that conveys determination and seriousness.