on a bike 还是 in a bike 工具前面加修饰词用什么介词?

一些英语问题.在墙上,the wall前面用什么介词；bike前面用in还是on,I go bike bicycle有什么不同.by bike；on a bike；on a bike的用法； in a car;b 英语在自行车上,介词用哪个啊,是on the bike 还是 in the bike 英语中by bike=on a bike还是in a bike by train =on a train还是in a t on the bike 还是in the bike on bike 和on a bike team前面介词加on还是in? day前面有修饰词用什么介词 e-bike用什么介词 He loves riding bike.和 he likes to ride a bike.bike用加s吗. every Saturday morning 前面用什么介词,on还是in? saturday afternoon前面用什么介词?on还是in?