重點：所謂的獨立主格，就是狀語從句簡化後的產物！不管是同位語還是獨立主格都是人們為了高效交流而簡化句子的結果！！獨立主格從此登上英語舞臺！並不是所有的狀語從句簡化後都會變成獨立主格！
時間狀語從句
After the meeting was over, all of us went home. 會議結束後我們都回家了。
簡化
The meeting being over, all of us went home. 開完會後我們都回家了。
簡化過程
①去掉狀語從句連接詞 after，時間邏輯是人的基本邏輯，沒有after,讀者也能讀出時間先後。↓
the meeting was over, all of us went home.
②去掉the meeting↓
was over, all of us went home.
③此時從句成了懸垂結構↑，即從句沒有主語，從句與主句的主語又不是一個。從句的意思產生了模糊，句子出現原則性錯誤。所以我們不能省略the meeting,將它請回來！↓
the meeting was over, all of us went home.
④was雖然是聯繫動詞，但在從句中撐起了謂語部分。縱觀我們以前的簡化，不管是名詞從句簡化，還是形容詞從句簡化，都是將一個句子簡化成為一個短語，狀語從句簡化也不例外！因此我們只能將動詞短語（was over）轉變成其他詞性短語！！↓
詞性：was over（動詞短語）→being over（現在分詞短語，形容詞性）
⑤此時的being over 具有形容詞性正好修飾主語 the meeting。↓
the meeting being over, all of us went home.
⑥此時being的意思與was的意思並無太大差別，只是being是形容詞性。由此時間狀語從句After the meeting was over 轉變成了時間狀語短語 the meeting being over。這也就是我們常說的獨立主格！↓
The meeting being over, all of us went home.
開完會後我們都回家了。
當時間狀語從句與主句同時發生時，經過我們的簡化就出現了一種形式，傳統語法將其稱之為伴隨狀語！！！！伴隨狀語下回說！
時間狀語從句簡化後也有其他形式，比如不定式或動名詞短語或介詞短語！！
Row of businessmen and women with paperwork in.
條件狀語從句
If the condition is favourable, he may succeed.若條件有利,他或許能成功。
簡化
The condition being favourable, he may succeed. 若條件有利,他或許能成功。
簡化過程
①去掉If↓
The condition is favourable, he may succeed.
②the condition不能動！↓
The condition is favourable, he may succeed.
③謂語短語轉換詞性
詞性：is favourable（動詞短語）→being favourable（形容詞短語）
④being favourable修飾the condition.條件狀語從句 If the condition is favourable，轉變成了條件狀語短語The condition being favourable↓。
The condition being favourable, he may succeed. 若條件有利,他或許能成功。
條件狀語從句簡化後也有其他形式，比如不定式或動名詞短語或介詞短語！！
原因狀語從句
He wrapped her up with great care because the night was dark and frosty. 夜又黑又冷,所以他把她裹得嚴嚴實實的。
簡化
He wrapped her up with great care, the night being dark and frosty. 夜又黑又冷,所以他把她裹得嚴嚴實實的。
簡化過程
①去掉because↓
He wrapped her up with great care, the night was dark and frosty.
②is dark and frosty（動詞短語）→being dark and frosty（形容詞短語）↓
He wrapped her up with great care, the night being dark and frosty. 夜又黑又冷,所以他把她裹得嚴嚴實實的。
原因狀語從句簡化後也有其他形式，比如不定式或動名詞短語或介詞短語！！
讓步狀語從句
Though she worked so hard, she failed again.
簡化
Working so hard ,he failed again.
簡化過程
Though she worked so hard, she failed again.
①去掉though↓
she worked so hard, she failed again.
②去掉she,因為和主句的she重複了！↓
worked so hard, she failed again.
③worked是動詞，不能做句子開頭，不能單獨帶領句子！需轉變詞性！↓
詞性：worked so hard（動詞短語）→working so hard（動名詞短語）
④讓步狀語從句 Though she worked so hard轉變成了讓步狀語短語 working so hard.↓
Working so hard, she failed again.
讓步狀語從句簡化後也有其他形式，比如不定式或獨立主格或介詞短語！！
地點狀語從句
How did you know where you can find me ?
你怎麼知道在哪裡可以找到我？
簡化
How did you know where to find me ?↓
你怎麼知道在哪裡可以找到我？
簡化過程
How did you know where you can find me ?↓
How did you know where you are able to find me ?（can=be able to）
①where在句中作用較大，去掉後句意會發生巨大改變，這不是我們簡化的宗旨，所以不能去掉。↓
How did you know where you are able to find me ?
②去掉you↓，與主句的you重複！
How did you know where are to find me ?
③去掉are，be 動詞是聯繫動詞，無實際意義！↓
How did you know where able to find me ?
④去掉able↓，為了簡化人們將able的部分意思賦予了to，此時的to 不是介詞to。此時的to find就是able to find，也就是can find。
How did you know where to find me ?
地點狀語從句簡化後還有其他形式。
目的狀語從句
I came here in order to ask some question.
簡化
I came here to ask some question.
目的狀語簡化後還有其他形式。