"变成" 的英语表达是 "become"。
"Become" 是英语中的动词，意思是"变成，成为"。这个词源自古英语 "becuman"，最早记录于13世纪。
例句：
She became a doctor after graduating from medical school. (她在医学院毕业后成为了一名医生。)
The caterpillar became a beautiful butterfly. (毛毛虫变成了一只美丽的蝴蝶。)
He will become the next president. (他将成为下一任总统。)
注意："Become" 还可以用来描述某人或某物适合某种身份或状态，例如：
She became the perfect person for the job. (她成了这份工作的最佳人选。)
The dress became her very well. (这件衣服非常适合她。)