by train 乘坐火車,介詞by+交通工具名詞（中間不用冠詞）,只能作狀語take a/the train 乘坐火車,動(dòng)詞短語,可以作謂語例如：He usually goes to school by train.=He usually takes a/the train to school.祝你開心如...那為什么My mother goes to work () her bike, but I go to school ( ) bus. A in;on B by;by C on;byDby;on 選c而不選b呢介詞by+交通工具名詞（中間不用冠詞,也不用人稱代詞），on one's bike=by bikeby bus= in a busby ship= on a ship