His grandparents died ten years ago.(同义句)
His grandparents died ten years ago.(同义句)
① His grandparents___ _____ _______ since __ _____ ____.(6格)
②His grandparents ___ _____ _______ _____ ten years.(4格)
③___ _____ _______ _____ since his his grandparents died.(4格)
④___ _____ _______ ten years since his grandparents died.(3格)