Present Perfect * Used to talk about unspecified time in the past. * Also you can use for and since talking about action that began in the past and is still going on now. source: https://www.youtube.com/watch?v=L9EKqQWPjyo Example: This is an amazing song written by Bob Dilan. It is called "Things have changed ". This title uses Present Perfect tense. Present Perfect Progressive Used to talk about something that started in the past and is continuing at the present time. source: https://open.spotify.com/track/1Uz4hbxBXIDjmoHAyVPZnF Example: " I've Been Thinking About You" is a song by British-American band Londonbeat. The title uses Present Perfect Progressive tense. Past Perfect Used to talk about an action that occurred before another action in the past. source: https://www.grupooneair.com/chesley-sullenberger/ “We were in a situation we hadn’t trained for. All we had to go on was a brief classroom discussion and a few pa...