you are walking along the bank of river语法对吗?you are walking along on the bank of riveryou are walking along on the river bank这三句都对吗?如果错了错在哪里

you are walking along the bank of river 这个对
along 本身就是介词了， 意思是沿这河岸走。 不用加别的介词了

You are walking alone the river. This statement is right

第一句话是对的.walk along 就是沿着……走的意思

你要么说the bank of the river，要么说the river bank。the bank of river不正确。
along是介词，后面不能再有on。
所以，严格地讲，三句话都不正确。
正确的是：
you are walking along the bank of the river
或者
you are walking along the river bank