“被烧光”常见的英文表达是 “be burned to the ground” 或 “be completely burned down”。
“be burned to the ground”：强调建筑物等被彻底烧毁，只剩下地基或残骸，程度较重。例如：The old warehouse was burned to the ground in the fire.（那座旧仓库在大火中被烧光了。）
“be completely burned down”：侧重于表达某物被完全烧毁的状态，同样传达“被烧光”的意思。例如：The forest was completely burned down by the wildfire.（森林被野火完全烧光了。）