Question

英语句子成分分析。

A linking word is a word used to connect the subject of a sentence to further Information about the state.

word后used to connect the subject of a sentence to further Information about the state.
这这是什么句子成分？由什么充当？
详细些，我基础太差了。谢谢。

Answer 1

A linking word 做主语
is 系动词
a word 做表语
is a word 系表合成谓语
used to connect the subject of a sentence to further information about the state. 动词过去分词短语 做定语修饰a word,相当于 …a word which is used。
to further … 这里further 用作动词短语表示目的。

Answer 2

used to connect the subject of a sentence to further Information about the state.
为过去分词词组作后置定语，修饰a word.
过去分词作后置定语时，往往表示被动含义，本句也不例外，【是被用来的】，其功效向相当于一个定语从句。可转换。
本句可转换成：A link word is a word that/which is used to connect the subject of a sentence to further Information about the state.
to further … 为动词不定式作目的状语。

Answer 3

word后面一长串都是对word的限定，也就是定语从句，word和used中间省略了that。后面翻译为被使用去连接整个陈述过程的主要部分和其他信息。

Answer 4

used to connect the subject of a sentence to further Information about the state为过去分词短语作后置定语，修饰a word。

Answer 5

翻译：连接词是用来连接句子主语和状态的进一步信息的词。
具体用法和解释可参考如下链接（搜狗百科）：
https://baike.sogou.com/m/fullLemma?lid=5928318&fromTitle=连接词