句子成分英语的句子成分主要有六种:即主语、谓语、宾语、定语、状语和补语。(可以熟记为:主谓宾,定状补)除了这六种主要成分之外,还有“表语”和“同位语”的说法。但表语和系动词一起作谓语,因此划分成分时,划分在谓语上。同位语分为主语同位语和宾语同位语,属于主语或宾语的一部分。主语主语是一个句子所叙述的主体,一般位于句首,通常由名词性的词来充当。可以作主语的词性或语法结构:1.名词 2.代词 3.数词 4.名词化的形容词(如the rich)5.不定式 6.动名词 7.主语从句等表示。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.