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Phrasal Verbs Using 'On' & 'Upon' - Striving, Risking, or Revealing (On)

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Phrasal Verbs With 'On' & 'Upon'
to focus on

to direct one's attention, energy, or efforts toward a particular goal, task, or objective

Ex: The students were focusing on their final exams this past month. 
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to inform on

to provide information to law enforcement or authorities about someone's actions, particularly illegal or unethical actions

Ex: He decided to inform on his neighbor, who had been involved in a series of burglaries. 
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to insist on

to demand something firmly and persistently

Ex: The customer insisted on a replacement for the damaged product. 
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to let on
to let on
[Verb]

to reveal information that was meant to be kept a secret

Ex: He let on that he knew about the promotion before anyone else. 
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to tell on

to give away information one has obtained about someone, particularly to someone in authority

Ex: He told on his classmates when he saw them cheating on the test. 
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to look on

to watch an event or incident without getting involved

Ex: Passers-by simply looked on as the two men argued heatedly on the sidewalk. 
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to spy on
to spy on
[Verb]

to secretly observe someone or something with the intention of gathering confidential or hidden information

Ex: The detective decided to spy on the suspect to gather evidence for the case. 
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to work on

to focus one's effort, time, or attention on something in order to achieve a particular goal

Ex: She's working on a solution to address the recurring issues in the system. 
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