Not knowing how to operate a switchboard,I had to ask the of

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Not knowing how to operate a switchboard,I had to ask the office for help.这句话为什么开头要用Not knowing而不能用Having not known

去看一下独立主格亲〜
2. 不能省略being (having been)的情形：在下列两种情况下,独立主格结构中的being（或having been）不能省略.
(1) 独立主格的逻辑主语是代词时.如：It being Sunday, we went to church.因为是星期天,我们去做了礼拜.
(2)在There being+名词的结构中.如：There being no bus, we had to go home on foot.因为没有公共汽车,所以我们不得不步行回家.
3. 在“名词（或代词）+介词短语”构成的独立主格结构中,一般不用形容词性物主代词和冠词.如： Miss Smith entered the classroom,book in hand.史密斯小姐走进了课室,手里拿着一本书.比较with的复合结构.如：Miss Smith entered the classroom,with a book in her hand.
4. 独立主格结构没有所有格形式The chief-editor arriving, we began the meeting. 主编来了,我们开始开会.(比较动名词复合结构.) 再答：百度百科里面有手机不方便送地址〜sorry

Not knowing how to operate a switchboard,I had to ask the of -----how to operate a switchboard,I had to ask the office su ______ how to operate a washing machine,I had to ask my wife I had to learn how to ask a shopkeeper for things I didn‘t k 句子分析：Not knowing what to do,he decided to ask the teacher fo not knowing how to do it,______ so knowing how to ask for information politely is impaotant Knowing how to ask for information p is v Knowing how to ask for information politely is important,isn so knowing how to ask for information politely is important Knowing how to ask for information politely is important i had thought that the world of beauty to not