There is a bird____[sing]in the tree

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Thereisabird____[sing]inthetreeThereisabird____[sing]inthetreeThereisabird____[sing]inthetreesinging

There is a bird____[sing]in the tree
There is a bird____[sing]in the tree

There is a bird____[sing]in the tree
singing,ing形式表伴随,这句话的意思是有一只鸟在树上唱歌.

singing