how在名词性从句中是连接副词，在句中不做主要成分。how引导名词性从句有如下几种情况。1、 表方式、方法，相当于the way in which。可译作“怎样、怎么”。例如。I didn&#39t know how he came here。2、 表程度上的感叹，可译作“多么……、真……、这么……”等。例如。He said how beautiful those flowers were。He said how he regretted the hours wasted in the woods and fields。He was surprised at how much water I had drunk。3、 表对程度、数量、情况的疑问。例如。