y train 乘坐火车,介词by+交通工具名词（中间不用冠词）,只能作状语 take a/the train 乘坐火车,动词短语,可以作谓语 例如： He usually goes to school by train. =He usually takes a/the train to school. 祝你开心如意! 再问： 那为什么My mother goes to work ( ) her bike, but I go to school ( ) bus. A in;on B by;by C on;by Dby;on 选c而不选b呢 再答： 介词by+交通工具名词（中间不用冠词,也不用人称代词）， on one's bike=by bike by bus= in a bus by ship= on a ship
