连词

连词是起连接作用的词，通常用来连接两个并列成分。

例如：

• 连接同类型的词：
  1. 连接名词：I like coffee and tea.
  2. 连接动词：He wrote and published many books.
  3. 连接形容词：She is kind and beautiful.
  4. 连接副词：Please work quickly and carefully.
• 连接同类型的短语：
  1. 连接名词短语：I have a red book and a blue book.
  2. 连接动词短语：I want to learn new languages and travel around the world.
  3. 连接介词短语：Gina's books are everywhere: on her bed, on the sofa and under the chair.

但最常见的用法，还是连接句子：

• She studies very hard, and she often help her classmates.
• If you leave, I will follow you.
• Anthough she is young, she is very talented.
• He often exercises, so he is very strong.

连词的分类

连词一般分两种：

• 并列连词：连接两个并列成分
  • 表承接：and （和；并且；然后）
  • 表转折：but （但是）
  • 表选择：or （或者）
• 从属连词：引导状语从句
  • 引导原因状语从句：because（因为）
  • 引导结果状语从句：so（所以）
  • 引导条件状语从句：if（如果）
  • 引导时间状语从句：
    • when/while（当...时）
    • until（直到）
    • since（自从）
  • 引导让步状语从句：although/though（虽然，尽管）

连词的基本用法：连接句子

五个基本句型

SV, SVC, SVO, SVoO, SVOC

都是主语（S）开头。

连词经常用来连接句子。而句子一般由主语开头，所以连词一般会放在主语前面。

例如：

• She studies very hard, and she often help her classmates.
• If you leave, I will follow you.
• Anthough she is young, she is very talented.
• He often exercises, so he is very strong.

由于要连接句子，所以句子一般比较长，并且经常有逗号。

综上，一般需要连词的情况可以概括为：主语前，有逗号，句子长