一、to extent是什么短语？
这是个介词属性的短语
二、程度状语连词？
程度状语从句用来表示动作或状态所达到的程度，其连词主要有：so that, such that, as (so) far as, as (so) long as, to the degree (extent) that, in so far as 等。
例：
Her heart beat so that she could hardly breathe. 她心跳剧烈，几乎都无法呼吸。
His courage is such that she does not know the meaning of fear. 他胆子很大，不知道什么叫做害怕。
So far as the weather is concerned, I do not think it matters. 就天气而论，我觉得没什么要紧。
As long as you need me, I'll stay. 只要你需要我，我就留下。
A computer is intelligent only to the degree (extent) that it can store imformation. 计算机的智能仅限于它能存储信息。
I'll help you as far as / in so far as I can. 我会尽可能帮助你。
1、副词一般在句子中做状语
He speaks English very well. 他英语说得非常好。
其中的“very”是程度副词，用来修饰“well”。“very well”是修饰“speak”的程度状语。
2、不定式在句子中可以作目的状语
I come specially to see you. 我专门来看你。
3、介词短语
Ten years ago, She began to live in Dalian.从十年以前开始，她开始住在了大连。
4、从句作状语
When she was 12 years old, she began to live in Dalian.她12岁的那一年开始居住于大连。
5、分词作状语
Having had a quarrel with his wife, he left home in a bad temper。由于和妻子吵了一架，他愤怒的离开了家。
6、名词作状语
We must get together again some day.将来某天我们必能再相聚。
