If you want handouts or posters, you can download a sheet of Past Perfect timelines as well as a sheet of Past Perfect time expressions (like ever, for, ago, just, etc.) from www.insightstoenglish.com/.
It's a lot of information in one video, so by itself, this may seem overwhelming. But the methods in these videos are meant to be used together with whatever curriculum you're using; a teacher or a book can go through the material at a better pace for language learners, and in more detail. The point of this video is that Present Perfect should be used when you bring past and present together. But if you need more information on how to use it in the first place, there are plenty of other resources out there to help you with that!
Really useless tense....how can I know if I see an elephant in future? If an elephant appears in front of me should I close my eyes because some day I said "saw", but not "have seen"?? If I say "I saw an elephant" people won't understand me? Didn't get it...
There is plenty of overlap between "I saw and elephant" and "I've seen an elephant"; in place cases, the Past Simple or the Present Perfect could be used, and either would be fine! Past tenses only matter for the past, and that's it. With Present Perfect, the action or event may have happened in the past, but it still matters in the present (and maybe it also matters in the future, but maybe not - that's less important).
