此獨立形式只是一個小短語，而不是主謂完整的簡單句，又稱之為獨立分詞構(gòu)句。當(dāng)分詞意義上的主語不是主句的主語時，必須在分詞前保留意義上的主語，否則語意不通。示例：
Being ill in bed, I can't go to school.
Mother being ill in bed, I can't go to school.
1.獨立主結(jié)構(gòu)形式可用以表時間，理由，條件，伴隨狀態(tài)等。
He lay on the grass, the sun shining upon him.
= He lay on the grass, and the sun was shining upon him.
Weather permitting, I'll start tomorrow.
= If weather permits, I'll start tomorrow.
School being over, the boys went home.
= When school was over, the boys went home.
The sun having set, we arrived at the station.
= After the sun had set, we arrived at the station.
王牌重點：當(dāng)獨立主格結(jié)構(gòu)的主語表示“一般人”，如：we, one, you時，主語可省略，此用法常用于下列表達(dá)方式中：
generally speaking 一般來說
strictly speaking 嚴(yán)格地說
talking of …… 談到
speaking of …… 說到
judging from …… 由……來判斷
taking all things into consideration 把一切都考慮在內(nèi)
considering …… 考慮到……
[示例]
If we judge from his face, he must be ill.
= Judging from his face, he must be ill.
He has lots of books if we consider that he is young.
= He has lots of books, considering that he is young.