end up speaking in Chinese为什么用in?

问题描述:

end up speaking in Chinese为什么用in?
同上,不能去掉in么?是语法上的错误么?
另外还有一个问题:I learned a lot that way.这里不用in或是by么?是省去的么?总感觉读起来很奇怪额……

in chinese意为用中文,
如果去掉in 意思就变成了说中文
I speak chinese,I是主语,chinese是宾语
I speak in chinese.
in chinese是用来修辞speak这个动作的