英语句子成分和 英语句子成分和 英语句子结构讲 英语句子结构讲 解及练习 解及练习1. 主语（subject ）：句子说明的人或事物。 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 tree. （It 形式主语，主语从句是真正主语）( 一）指出下列句中主语的中心词 The teacher with two of his students is walking into the classroom. There is an old man coming here. The useful dictionary was given by my mo
