2016-2017学年人教版选修6 unit5 The power of nature grammar 课件 (3)-302edu教育资源网

Looking carefully at the ground, I made my way to the edge of the crater.

The –ing form used as an adverbial

Having experienced quite a few earthquakes in Hawaii already, I didn’t take much notice.

Having + past participle (the perfect –ing form) to refer to an action that took place before the time expressed by main verb.

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