现在分词：1、直接加ing：如 sing - singing, keep - keeping；

2、去掉e后加ing：如 make - making, have - having；

4、ie结尾的,改为y后加ing：如 lie - lying, tie - tying.

过去分词一般做定语,或者宾语补足语.如：he book left in the classroom yesterday is my English book.(leave---left 落下的).He walked into the forest,lost (lose--lost 迷失,迷茫)