请问一个语法问题

we are walking along this street 可以
along就是介词了，

along
[E5lCN]
adv.
往前, 向前
prep.
顺着, 沿着

along
a.long
AHD:[…-lông“, …-l¼ng“]
D.J.[*6l%80, *6l%0]
K.K.[*6l%0, *6l$0]
prep.（介词）
Over the length of:
顺着：
walked along the path.
顺着小路走
On a line or course parallel and close to; continuously beside:
纵长地，平行地：沿着一条近处的平行线或道路；并排连续的：
rowed along the shore; the trees along the avenue.
沿着岸划船；沿街的树木
In accordance with:
根据：
The committee split along party lines over the issue.
由于各自坚持自己政党的路线，委员会在这个问题上产生分歧
adv.（副词）
Forward; onward:
向前；朝前：
We drove along, admiring the view. Farther along, we passed a hitchhiker.
我们一边开车，一边观赏风景。前面更远处，我们经过了一个要求搭便车的旅行者
As a companion:
作为伙伴：
Bring your friend along.
带你的朋友一起来
In accompaniment or association; together:
陪伴，相关；一起：
packed an atlas along with other books.See Usa