骑自行车用英语的表示方法：ride on a bicycle；bicycle riding；ride a bike；by bike；ride on a bicycle。
骑（自行车，马，三轮脚踏车）：ride a bike；ride a horse；ride a tricycle骑自行车，骑马，骑三轮脚踏车，这三个短语里的ride都是骑的意思。
相关短语有：骑着自行车：be on the bike，bike riding，rides his bicycle。我骑着自行车：I ride a bike。骑着自行车走：ride on a bicycle。
双语例句：
1、那辆车横冲过马路，撞上了一个骑自行车的人。The vehicle careered across the road and hit a cyclist.
2、在伦敦骑自行车，你可得有胆量。You need strong nerves to ride a bike in London.
3、在城镇骑自行车常常比开车更方便。A bicycle is often more convenient than a car in towns.
4、我父亲教会了我骑自行车。My father taught me how to ride a bike.
5、我骑自行车下山到中途刹车失灵了。The brakes on my bike failed half way down the hill.