Phrasal Verbs Using 'On' & 'Upon' - Striving, Risking, or Revealing (On)
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to focus on
[Verb]
to direct one's attention, energy, or efforts toward a particular goal, task, or objective
Ex: She focused on completing the challenging assignment.
to inform on
[Verb]
to provide information to law enforcement or authorities about someone's actions, particularly illegal or unethical actions
Ex: The informant played a crucial role in helping the inform on the corrupt politician 's bribery scandal .
to insist on
[Verb]
to demand something firmly and persistently
Ex: Despite the delays, they insisted on completing the project according to the original plan.
to let on
[Verb]
to reveal information that was meant to be kept a secret
Ex: She let on about the surprise party when she mentioned the cake .
to tell on
[Verb]
to give away information one has obtained about someone, particularly to someone in authority
Ex: I wotell on you for accidentally breaking the vase if you help me clean it up .
to look on
[Verb]
to watch an event or incident without getting involved
Ex: The soldiers looked upon in horror as the battle raged before them.
to spy on
[Verb]
to secretly observe someone or something with the intention of gathering confidential or hidden information
Ex: The technology company faced allegations of developing software to spy on users and collect personal information .
to work on
[Verb]
to focus one's effort, time, or attention on something in order to achieve a particular goal
Ex: She is working on improving her language skills by practicing every day.

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