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What is it?
It is a bird.
What is it doing?
It is flying.
What is it?
It is a monkey.
What is it doing?
It is playing.
What is it?
It is a cat.
What is it doing?
It is jumping.
What is it?
It is a cow.
What is it doing?
It is eating.
What is it?
It is a fish.
What is it doing?
It is swimming.
What is it?
It is an elephant.
What is it doing?
It is running.
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
(?)
swim swiming
(?)