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Exercises: 下列的动词如何加 -ingdo-have-watch-skip-sing-dance-look-run-
doinghaving
singingdancinglookingrunning
watchingskipping
练一练,你最棒我现在正在写作业。看!玛丽正在上英语课。听!他们正在唱歌。 Listen! They are singing.
Look! Mary is having English class.
I am doing my homework now.