锡伯跟满人到底是什么关系？/ Are Sibe (Xibo) and Manchu People Related?

锡伯族据说是鲜卑拓跋人的一支，而且他们继承了族号，锡伯就是鲜卑（Sibe)的另一种译法。这差不多已是专家一致的说法了，可这里有个问题，鲜卑语属于阿尔泰语系的蒙古语族，而锡伯语则属于阿尔泰语系通古斯语族的满语支，基本上它就是满族的一种方言，现如今，满人中会讲满语的已经很少了，而研究满语的学者基本上是锡伯人。由此可见这个本应讲蒙古语的鲜卑人的一支不知何故突然改讲满语的一个方言了。到底是在什么时候，什么情况下锡伯人突然放弃了自己的语言而改讲他人的语言的呢？是在他们被异族打败后逃到满人的地盘然后就不得不讲满语了吗？要知道整个民族要改一种语言是一件很困难的事啊！更何况是在交通和通信都不发达的过去。满族据说祖先是肃慎，东汉至魏晋时称为挹娄，南北朝时称勿吉，唐朝时称靺鞨，辽朝至明朝末年时期称女真，跟鲜卑并没联系。那锡伯又是什么时候在什么情况下跟他们攀上亲的呢？

It is said that Sibo comes from Tuoba, one clan of Xianbei (Sibe). Actually Sibo and XianBei are two sides of the same thing. Almost all the experts agreed that Sibe and Xianbei are the same thing. But there is a problem. Although both terms are under the Altaic group; Xianbei was in the Mongolic language but Sibo is the Tungusic language. When and under what circumstances, did the Sibo people suddenly undergo a language shift? Is it because they were defeated by other groups and ran away to Manchuria then forgot their own language in favour of the Manchu language? The Manchu language is also under the Altaic group; the Tungusic Manchu branch is just like Sibo Language. Sibo language is very similar to the Manchu language. In fact, it is a dialect of the Manchu language. The first ancestors of the Manchu were the Sushen, a people who lived during the second and first millennia BC. They were followed by the Yilou people, who were active from AD 202 to 220. The Wuji followed in the 5th century and the tribes of the Mohe in the 6th century. One of the tribes of the Mohe, the Heishui (Amur River) tribe, eventually became the ancestors of the Jurchens, from whom the Manchu originated.
The Jurchens under the Wanyan clan established the Jin Dynasty (literally Golden Dynasty) that ruled the northern half of China (1115–1234) and rivaled the Song Dynasty in southern China. The Jin was conquered by the Mongols under Genghis Khan.
Before the 17th century, the ancestors of the Manchus were generally a pastoral people, hunting, fishing and engaging in limited agriculture and pig-farming. They were completely separate from the Xianbei. Today almost all of Manchu people are unable to speak the Manchu language. Most of Manchu language scholars in fact are Sibo people. But how could they switch from one language to another in those days both transportation and communication was poor remains a mystery.