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根據(jù)不同的變化規(guī)則,將下列動詞的-ing形式,分類寫在橫線上。
go, swim, come, read, speak, listen, write, clean,
talk, contact, make, shut, sing, put, turn, get, dance,
cook, watch, eat, play, wash, do, introduce
1. standing
2. taking
3. sitting
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1. going, reading, speaking, listening, cleaning, talking, contacting,
    singing, turning, cooking, watching, eating, playing, washing, doing
2. coming, writing;, making, dancing, introducing
3. swimming, shutting, putting, getting
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