今天咱们聊聊句子主干。
用S, V, O分别表示句子的主语, 谓语, 宾语.
通过之前咱们介绍找谓语动词和连词的方法把长难句拆分后, 开头没有连词的部分，我们就叫他句子的主干.
开头有连词的要分几种情况:
1、不是句子主干
如: Beijing is the place where I was born. 此句有两个谓语动词is/was born. 从属连词where, 所以I was born不是句子主干, Beijing is the place是主干.
2、如果有并列连词,就称它为主干的一部分,而且前面还有主干的另一个部分.
如: His mother gave his a new football as his birthday present and he liked it very much. 其中and为连词连接前面 His mother。。。。和后面he liked….因此主干就为整个句子.
句子的非主干结构比较多有 状语从句， 定语从句, 分词结构, 介词结构, 名称结构, 副词和独立主格结构(个人感觉"很能装的结构")
3、非主干在前，主干在后的结构 ______, S + V + O
- 状语从句When I was young, I liked to play basketball.When I was young做状语从句，可以改写为When young, I liked to play basketball
- 介词结构On Monday morning, we go to schoolOn Monday morning 介词结构作时间状语.With his help. I graduated from Beijing Institute of Technology.With 介词表伴随.
- 分词结构一种是: Doing sth…..Not knowing her address, I can't write to her.knowing 与句子主语呈主动关系.
另一种是: Done sth…..(表被动关系)Attacked from behind, he fell to the ground.
Attacked与主语呈被动关系. - 独立主格结构表现形式为: 逻辑主语+现在分词/过去分词/不定式….逻辑主语跟主句主语不同.
Weather permitting, we are going to play football.如果天气允许, 我们去踢足球. 前后句子主语不同. 前面分词形式.很明显独立主格结构. - 副词Surprisingly, we are the champion.没想到，我们是冠军.
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