He goes to school by bike,sometimes by bus.He goes to school by bike,it takes him 15 minutes.

问题描述:

He goes to school by bike,sometimes by bus.He goes to school by bike,it takes him 15 minutes.

语法上是没错的,但英语表达一般简单,不重复.He goes to school by bike and it will cost him 15 minutes.Sometimes,he goes by bus.