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动词变ing形式的两条小规则： a. 一般情况下，直接加ing；b. 以辅音、元音、辅音字母结尾的单词,双写最后一个字母+ing.如：run-running,
swim-swimming。
read reading
eat eating
run runing
jump jumpping swim swiming
(?)
(?)
(?)
(?)
(?)
run running
jump jumping
swim swimming
read reading
(?)
swim swiming
(?)
(?)
eat eating
(?)
jump jumpping
(?)
run running
swim swimming
jump jumping
What is it doing?
It is flying.
What is it doing?
It is eating.