walk in the streets 和 walk on the street(s) 和 walk along the street 和 walk down the street 和 walk up the street 的差別在哪裡？如果不好說明，請提供一些例句。

Sorry, but they don't all mean the same thing. Vivi, you say you are a native English speaker, but there are a few mistakes even in your short response.

"walking in the street": Walking directly on the street. Not used much. Imagine a policeman calling out to someone: "Stop walking in the street! A car will hit you!"

"walking on the street": Very similar to "walking in the street", the same really. Means literally you are walking on the street itself, not the sidewalk (pavement in British English).

"walking along the street": Not used much. But it is basically the same as "walking down the street." Maybe it's used more in British English.

"walking down the street": By far the most common of the four (at least in American English). This means you are walking on the sidewalk/pavement, parallel to a street. This is what people almost always do. This is the only phrase of the four here that you will need to use on a regular basis.