she boiled milk before she drank the milk.
问题描述：
she boiled milk before she drank the milk.
这句话对吗
答
she （had） boiled milk before she drank the milk.
在喝牛奶前,她先把牛奶煮沸了.
before从句是过去时,主句的动作是发生在它之前的,应该是用过去完成时,要加上助动词had.加had这句话就对了嘛时态是个最主要的问题，现在把用词再调整一下。She had boiled the milk before she drank it.牛奶是特指的，后面用it避免重复。