英语句子成分（一）句子主要成分有主语和谓语；次要成分有表语、宾语、定语、状语、补足语和同位语。（二）主语：主语是一个句子所叙述的主体，一般位于句首。主语可由名词、代词、数词、不定式、动名词、名词化的形容词和主语从句等表示。例如：划出主语并说出什么词充当的主语 During the 1990s, American country music has become more and more popular. We often speak English in class. One-third of the students in this class are girls. To swim in the river is a great pleasure. Smoking does harm to the health. The rich should help the poor. It is necessary to master a foreign language. When we
