change into emperor 这两个英语单词有什么语法知识请告诉我

上下文呢?change into emperor = become an emperor = ascend the imperial throne = be crowned emperor
He became emperor at age ten after his father's death.
He was crowned emperor in 1798.
一般不能说 change into emperor.只有在游戏中：He was a prince,then at level five he changed into emperor.