1. ä¸è¬ç´æ¥å ing, å¦ï¼playing,lookingç
2. ä¸åé³çeç»å°¾ç,å»æe, å ing: have-- having; leave -- leaving
3. 以ä¸ä¸ªè¾
é³åæ¯ç»å°¾çé读éé³è,ååæåä¸ä¸ªè¾
é³åæ¯,åå ing.è¿éçæ¡ä»¶é½å¿
须满足ï¼ä¸ä¸ªè¾
é³åæ¯ç»å°¾+é度é³è+éé³èï¼
stop ï¼åªæä¸ä¸ªé³è,é常çåé读é³èï¼-- stopping
begin ï¼åé¢ä¸ä¸ªæ¯é度é³èï¼ -- beginning
4,以iæieç»å°¾ç,æiæieæ¢æyåå ing,å¦,lie lying,die dyingç
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