Sure, here are the explanations and examples for the given phrases

Sure, here are the explanations and examples for the given phrases:

1. 
   Compliment smb on: to express admiration or approval of someone for something they have done or for a quality they possess. Example:
   

• 
  I complimented my friend on her amazing presentation skills.
  
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  The manager complimented his team on their hard work.
  
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  She complimented him on his new haircut.
  

2. 
   Comply with: to act in accordance with a rule, request, or demand. Example:
   

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  The employees were required to comply with the company's dress code.
  
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  The driver had to comply with traffic laws to avoid getting a ticket.
  
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  He didn't comply with the teacher's instructions, which resulted in a poor grade.
  

3. 
   Conceal smth from smb: to hide or keep something secret from someone. Example:
   

• 
  He concealed the truth from his parents about his poor grades.
  
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  The company tried to conceal information about their faulty product.
  
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  She concealed her emotions from her friends.
  

4. 
   Concentrate on: to focus one's attention or efforts on a particular task or activity. Example:
   

• 
  He needed to concentrate on studying for his final exam.
  
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  The coach told the players to concentrate on their footwork.
  
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  She found it hard to concentrate on her work with all the noise in the room.
  

5. 
   Confidence in smb: the belief or trust in someone's abilities or character. Example:
   

• 
  The CEO had confidence in his team to meet the project deadline.
  
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  He lacked confidence in his friend's driving skills.
  
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  She gained confidence in herself after receiving positive feedback from her boss.
  

6. 
   Confusion over: a state of uncertainty or misunderstanding about something. Example:
   

• 
  There was confusion over the location of the meeting.
  
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  The students had confusion over the exam format.
  
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  There was confusion over the new policy changes in the company.
  

7. 
   Congratulate smb on smth: to express joy or praise for someone's achievement or success. Example:
   

• 
  I congratulated my friend on her acceptance to the university.
  
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  The team congratulated their captain on scoring the winning goal.
  
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  She congratulated her colleague on receiving a promotion.
  

8. 
   Connection between: a link or relationship between two or more things. Example:
   

• 
  There is a strong connection between a healthy diet and good physical health.
  
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  The detective found a connection between the two suspects.
  
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  She realized the connection between her actions and their impact on the environment.
  

9. 
   In connection with: relating to or concerning something. Example:
   

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  The police are investigating a crime in connection with a robbery.
  
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  The news report was in connection with the recent election.
  
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  The lawyer mentioned a legal case in connection with a similar lawsuit.