• Present Perfect

• Read and listen. Listen again and repeat.
• 
• Use the present perfect for:
  -indefinite times in the past

  -recent events/news
  

  -non-specific time

  
  

  Add not for negative statements. 
  

  
  

  Remember! Use the contraction 've for have and 's for has. Combine not with have/has.
•  Click on the play button to hear the audio

• Indefinite time	Recent event	Non-specific time
  I've researched many topics as a postgraduate student.	Sam has just started  a new job as an academic advisor.	I have read my notes ten times.
  She hasn't enjoyed her freshman year.	The new quad hasn't opened yet.	They have not visited the library.

 Source : Alison