PRESENT PERFECT PRACTICE: EVER, NEVER, SINCE, FOR, JUST, ALREADY AND YET

We use the Present Perfect to say that an action happened at an unspecified time before now. The exact time is not important. You CANNOT use the Present Perfect with specific time expressions such as: yesterday, one year ago, last week, when I was a child, when I lived in Japan, at that moment, that day, one day, etc. We CAN use the Present Perfect with unspecific expressions such as: ever, never, once, many times, several times, before, so far, already, yet, etc.
In these websites you can find lots of online activities where you can have a good practice of this grammar
Present perfect websites

The cat's whiskers! Mustachioed moggy goes viral in hilarious new advert

Moustachioed cat storming the internet as the star of the new ad for mobile phone company Three is a
seven-month-old cat called Bronte. With her grey hair, moustache and unusual looks, she's not your typical star. The ad has been viewed millions of times after being launched a few days ago. The cute cat was teamed with five-year-old child model Jolie Forrest.
Read about it and watch the video on Daily Mail

World's Toughest Job Ad Goes Viral

24 applicants were in for a surprise for a job that listed no breaks and unlimited hours.Inhumane conditions, no vacation and no pay: Staged job interviews show how being a mom is the toughest position in the world. The actor playing the interviewee told applicants that the open position was for a 'director of operations' job. When he went into the demanding requirements of the job they all acted incredulous, rolling their eyes, frowning and scoffing. If you want to Read more about this issue or See the video, click on these previous links.