So is the beginning of the sentence
句首───The beginning of a sentence;也是───Yes
The left dislocation construction refers to a syntactic structure in which a constituent is moved to the beginning of a sentence and the original position is usually marked by a pronominal element.───左移位指一种句法结构，其中一个成分被移至句首，此时原来的位置往往通过一个代词成分标出。
If the subject is marked as a subject with an ending, it need not come at the beginning of a sentence.───如果主语词尾有主语标记，那么主语就不必须出现在句首。
The left dislocation construction refers to a syntactic structure in which a constituent is moved to the beginning of a sentence and original position is usually marked by a pronominal element.───左向移位是功能语法中的一种句法结构，其中一个成分被移至句首是主位结构分析中的一个分支。
"Guanyu" as a topic marker is often situated at the beginning of a sentence, occasionally locates the middle or ending.───“关于”标记话题常常居于句首，也可以居于句中或句尾。
We usually place the part to be stressed at the beginning of a sentence so as to give emphasis.───我们往往把强调的部分放在句首。收藏指正
The left dislocation construction refers to a syntactic structure in which a constituent is moved to the beginning of a sentence and the original position is usually marked by a pronominal element.
Coordinating conjunctions are meant to join words, phrases, and clauses; a coordinating conjunction is left dangling without a role to play when it comes at the beginning of a sentence.
The left dislocation construction refers to a syntactic structure in which a constituent is moved to the beginning of a sentence and original position is usually marked by a pronominal element.