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简介：
1.一般动词直接在词尾加-ing:
read → reading (读)
talk → talking (交谈)
sing → singing (唱歌)
study → studying (学习)
2.以不发音的e结尾的动词，先去e再加-ing:
write → writing (写)
skate → skating (滑冰)
ride → riding (骑)
drive → driving (驾驶)
3.以重读闭音节结尾且末尾只有一个辅音字母的动词，双写这个辅音字母再加-ing (辅元辅)：
swim → swimming (游泳)
cut → cutting (切，割)
run → running (跑)
get → getting (得到)
4.少数几个以ie结尾的动词，变ie为y，再加-ing:
lie → lying (躺，撒谎)
die → dying (死)
tie → tying (系，捆绑)
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