1.直接加上ing,占大多数如：doing,playing.,seeing等
2.不发音e结尾的,去e加上ing
如：came-caming,make-making,dance-dancing等
3.以重读闭音节结尾,并且只有一个辅音字母的,双写辅音字母在加ing
如：begin-beginning,run-running,sit-sitting,shop-shopping等