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1.Will, still watching, saw the cat behave curiously.
2.When it had gone past he crossed the road, keeping his eyes on the spot where the cat had been investigating.
3.While sitting by a pool, Ferdinand sees a frog.
4.Before leaving his kingdom, he calls his son to him.
5.Not knowing her address, I can't write to her to express my gratitude.
6.Having lived with the girl for 5 years, we all know her very well.
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1.六个例句中动词ing形式的逻辑主语都是句子的主语。
2.由句5可知，动词ing形式的否定式是在其前加not。
3.在句3中，动词ing形式短语前用while，为了强调与谓语动词的动作同时发生；在句4中，动词ing形式短语前用before，为了强调在谓语动词的动作之前发生。
4.由句6可知，动词ing 形式的完成式为having done。
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