sometimes是一个时间副词,在你说的句子中位置都可以.
可以放在句首,句尾,主语后面以及 动词后面
你这个句子应该是is以及life吧?
可以说Abortion is sometimes ...,或 Abortion is used sometimes to save ...,还可以,Abortion is used to save the mothers’ lives sometimes.
Sometimes abortion is used to save the mothers' lives.
很灵活