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When: 1. you use it as an adjective (The TORN page was on the floor); 2. you turn an Active verb into the Passive Voice (Dickens wrote "D. Copperfield" = "D. C" was WRITTEN by Dickens); 3. you construct a Perfect Tense (we have danced = Present Perfect; they had turned = Past Perfect; I would have known = Past Conditional etc).

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13y ago

What else can I help you with?