"My mother has come back" 这句话用英语可以说为 "My mother has returned."
来源：
"come back" 和 "return" 都是动词，表示回到原处。
英文例句及其中文翻译：
She has come back from her trip to France. 她从法国旅行回来了。
He has returned to his hometown after many years. 他在多年后回到了家乡。
They will come back next week. 他们下星期会回来。
He has just returned from his business trip. 他刚刚从商务旅行回来。