There must be a dog sitting behind it .为什么sit 后面加ing

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Theremustbeadogsittingbehindit.为什么sit后面加ingTheremustbeadogsittingbehindit.为什么sit后面加ingTheremustbeado

There must be a dog sitting behind it .为什么sit 后面加ing
There must be a dog sitting behind it .为什么sit 后面加ing

There must be a dog sitting behind it .为什么sit 后面加ing
sitting behind it 为独立主格结构,在这里做表语补足语.