Li venas ĉiam, kiam oni ne bezonas lin = He always comes when one does not want him.
Por ke vi estu elektata, vi bezonas batali kun ekstrema energio = In order to be elected (that you may be elected), you need to fight with extreme energy.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "bezonas" in a variety of sentences. We hope that you will now be able to make sentences using this word.