1、第一类 直接加 ing1. look-looking2. catch-catching3. do-doing4. play-playing5. go-going6. buy-buying7. say-saying8.see-seeing9.bring-bringing10.help-helping11.sing-singing12.draw-drawing13.work-working14.watch-watching15.clean-cleaning16.learn-learning17.jump-jumping18.be-being19.fly-flying20.stick-stickin
2、g21.collect-collecting22.cry-crying23.walk-walking24.build-building25.hunt-hunting26.fish-fishing27.eat-eating28.listen-listening29.read-reading30.stand-standing第二类 以 e 结尾的，去掉 e，再加 ing1. ride-riding2. bake-baking3. shake-shaking4. have-having5. dance-dancing6. write-writing7. make-making8. come-coming9. take-taking第三类 单独记 最后一个字母重复，再加 ing1. swim-swimming2. get-getting3. run-running4. put-putting
