句子成分讲解与练习 细读、质疑、识记 清原高中外语组于超英整理改编 2011，8，31英语句子成分和英语句子结构讲解及练习主语（subject）: 是执行句子的行为或动作的主体。The sun rises in the east.（名词） He likes dancing.（代词）Twenty years is a short time in history. (数词)Seeing is believing. （动名词）To see is to believe. （不定式） What he needs is a book. （主语从句）It is very clear that the elephant is round and tall like a
