正老师,麻烦您帮我看看这个语法问题,谢谢

They went down to the harbour to see if they had fresh fish.
这里用了 go down to,把它改成go to虽然可以 但意思没有前者全面
这里 down是表示方位的副词 有向下或 一直延续的意思
.如 Go down to the bottom of the page and then stop.
念到这一页底下停止.
来自《简明英汉词典》
4. Go down to my bedroom, and bring a clean shirt.
下楼到我卧室去, 拿一件干净衬衣来.
来自《简明英汉词典》
5. Few of his works will go down to posterity.
他的作品没有几件会流传到后世.