My mother often goes to work by a bus every morning

这句话明显有语法错误,By+交通工具 中间不加任何冠词 这个一定要记住类似的by bus by air by bike 等等,如果你想要加冠词 可以换成take 比如说 take a bus ,take a plane 但是bike 我们一般用ride a bike 希望你要记...