He usually goes to school by bike还是bys bike?

问题描述:

He usually goes to school by bike还是bys bike?
第三人称后已经用单数了,后面还要第三人称单数吗 ? 如果是其他的。

by bike, by是介词,不是动词,只有动词才有各种人称格式,介词就像on,at,in等一样,不用变化的