The babies which the nurse is responsible are crying altogether.
这个句子的意思是：那位护士负责的婴儿全都哭起来了。
我们先来看看这个句子的结构。这个句子是含有定语从句的复合句。主句是the babies are crying altogether，从句是有which引导的which the nurse is responsible。
我们再来看先行词，先行词是babies，指代人，在定语从句做宾语。babies是做谓语的宾语，还是做........的宾语。the babies the nurse is responsible（这个护士负责的婴儿）。表示“负责......”，用responsible这个词的话，有个固定的搭配模式：responsible for。由此，我们看出先行词是做介词for的宾语，而我们句子少了介词for。我们也可以把for提到句首，用介词 which来引导这个定语从句。因此，我们今天分析的病句的正确表述为
The babies which the nurse is responsible for are crying altogether.
The babies for which the nurse is responsible are crying altogether.
