I am something that can run but cant walk,what an I.

the answer is :
river

heyhey

同意楼上的
我不会跑但是能走，我是什么东西？

car

And the plane or the bus ,

water

This is a riddle.
Can run but cannot walk.
That's a clock.

Run 在这里不仅是“跑”的意思；还是“运转 运行”的意思。
所以是时钟