骑自行车的英文写法有好几种，相关如下：
一、Ride on a bicycle 例句：
（1）请你教我怎样骑自行车。Teach me how to ride a bicycle.
（2）最近我开始经常散步和骑自行车。Recently I've started to do a lot of walking and cycling
（3）我晚上要外出的时候，我宁愿骑自行车而不是开车。When I'm going out in the evening I use the bike if I can rather than the car.
二、ride a bike 例句：
（1）如果我是你的话，我会骑车上班。If I were you, I'd ride a bike to work.
（2）我以前经常玩轮滑，但当我年纪大了以后，我选择了骑自行车。I used to play regularly skating, but when I grow older, I chose to ride a bike.
（3）他可以骑自行车，但他不能开车。 can ride a bike, but he can't drive a car.
三、by bike 例句：
（1）除了雨天之外，她总是骑自行车上班。She usually goes to work by bike except on rainy days.
（2）我骑自行车到了河边。I went to the riverside by bike.
（3）你骑车还是坐车去？Are you to go there by bike or by bus?
注意：bicycle是一个英语单词，可以用作名词和动词，可以翻译为自行车、脚踏车，等等。bike是名词，指自行车或摩托车，一词多义。
扩展资料：
（1）Bike：名词，指自行车或摩托车，一词多义。
（2）形容词性动词： 骑脚踏车(或摩托车)
She biked all the way to the supermarket. 翻译：她一路骑脚踏车去超市。
（3）<by bike>和<ride a bike>的区别：by bike 属于副词短语，指的是交通方式，比如说别人问，你一般上学用什么交通工具，你回答“I go to school by bike”,而ride a bike 属于动词短语，指的是动作，别人问你说，你在干吗？你说：“I am riding a bike”(正在骑车)而不能说I am by bike,因为by bike 是指交通方式。
参考资料来源：百度百科：bike
骑自行车的英文：
astride a bicycle
by bicycle
cycle
ride on a bicycle
ride on a cycle
参考例句：
No cycling
不许骑自行车
Difficult terrain for cycling
骑自行车难以行走的地带
Play with a ball,toy,bicycle
玩球、玩玩具、骑自行车玩
He can't maintain enough equilibrium to ride a bike.
他骑自行车不能保持平衡。
You'll never learn to ride a bicycle if you don't practise.
假如你不练习的话，就永远学不会骑自行车。
Ride your bike or carpool whenever possible : In many of the cities in the US it is hard to get by without a car.
尽可能骑自行车或合伙使用汽车： 在美国的许多城市，出门没车是很困难的。
Almost half of those who die in road traffic crashes are pedestrians, cyclists or users of motorized two-wheelers.
在道路交通事故死亡者中，近一半是行人、骑自行车或开两轮机动车的人。
bicyclists often ride as though two-wheeled vehicles are exempt from all traffic laws
骑自行车者无拘无束，仿佛两轮车就可以不遵守交通规则似的。
He eyed the horseshoe poster over the gate of college park: cyclist doubled up like a cod in a pot.
他望了望贴在学院运动场大门上的那张马蹄形海报:骑自行车的恰似锅里的鳕鱼那样蜷缩着身子。
They like riding bicycles.
他们爱骑自行车。