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Here are the answers to your questions: 26. Could you turn on the lights? Do you mind turning on the lights? 27. My father would tell you the truth if he came to your house (Using past participle): My father would have told you the truth if he had come to your house. 28. Pictures were painted by Picasso. They are usually sold for millions of pounds. (Using present participle): Pictures painted by Picasso are usually being sold for millions of pounds.