1. In a medium bowl, stir together the olive oil, ranch dressing, Worcestershire sauce, rosemary, salt, lemon juice, white vinegar, pepper, and sugar. Let stand for 5 minutes. Place chicken in the bowl, and stir to coat with the marinade. Cover and refrigerate for 30 minutes.
2. Preheat the grill for medium-high heat. Thread chicken onto skewers and discard marinade.
3. Lightly oil the grill grate. Grill skewers for 8 to 12 minutes, or until the chicken is no longer pink in the center, and the juices run clear.
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