想问下过去式和过去分词的区别.比如：Slang words can be popular for a time，but then forgot and not used any more.中forgot为什么要用forgotten forgotten 作为被动语态be done 结构中的done
一.写出下列动词的过去式和过去分词 walk walked walkedask asked askedboil boiled boiledturn turned turnedwash washed washedempty emptied emptiedopen opened openedpaint painted paintedtype typed typedair aired airedsharpen sharpened sharpenedhave had hadclean cleaned cleanedlisten listened listenedanswer answered answered
二，写出下列动词的过去式和过去分词 air，aired，airedclean，cleaned，cleanedboil，boiled，boiledwash，washed，washedtype，typed，typed，empty，emptied，emptiedpaint，painted，painted，sharpen，sharpened，sharpenedhave，had，hadgo，went，goneam/is，was，beenare，were，beenpack，packed，packedleave，left，left
