grammar presentation

 http://www.powershow.com/view/d92ba-MmU0O/The_past_perfect_tense_powerpoint_ppt_presentation

https://www.slideserve.com/kemp/past-participles#google_vignette

http://premierskills.britishcouncil.org/en/learn-english/lesson-21-david-tells-story-about-tottenham-hotspur