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1、动词-ing形式的构成1. 直接加-ing 例：go-going ask-asking look-looking eat-eating clean-cleaning camp-camping野营jump-jumping wait-waiting2. 以y结尾直接加-ing 例：hurry-hurrying carry-carrying study-studying cry-crying play-playing stay-staying worry-worrying3. 以不发音字母e结尾的动词，先去e，再+-ing 例：write-writing make-making take-takin
2、g have-having come-coming chase-chasing see-seeing（特例）4. 末尾只有一个辅音字母，双写这个字母，再+-ing cut-cutting shop-shopping; swim-swimming; plan-planning ; chat-chatting drop-dropping; stop-stopping; hit-hitting 打撞; prefer-preferring; trek-trekking长途跋涉 babysit-babysitting ; You are kidding！双写 shut-shutting关闭 spit-spitting吐痰 get-getting sit-sitting put-putting run-running begin-beginning 5. 特例：die-dying lie-lying躺 tie-tying系，捆 ，扎 6. 既可以双写，也可以不双写travel-travel（l）ing ； quarrel-quarrel（l）ing争吵