The problem with participles is that they are sometimes easily confused with gerunds. The standard way to tell them apart is that a gerund acts as a noun (Skiing is fun) whereas a participle acts as a verb (Skiing down the hill, Bob remembered he hadn't turned off the oven).
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The problem with participles is that they are sometimes easily confused with gerunds. The standard way to tell them apart is that a gerund acts as a noun (Skiing is fun) whereas a participle acts as a verb (Skiing down the hill, Bob remembered he hadn't turned off the oven).