常见的须双写的动词：1. babysit-babysitting-babysat-babysat 临时照看婴儿2. ban-banning-banned-banned禁止3. bar-barring-barred-barred闩住；禁止4. bat-batting-batted-batted击球5. beg-begging-begged-begged乞求，乞讨6. begin-beginning-began-begun开始7. chat-chatting-chatted-chatted聊天8. clap-clapping-clapped-clapped拍掌，拍打9. commit-committing-committed-committed犯(罪),委托10. control-controlling-controlled-controlled控制11. cut-cutting-cut-cut切12. dam-damming-dammed-dammed筑坝，拦住13. dip-dipping-dipped-dipped浸，沾14
