若是强调过去时: I came to school by bike.= I came to school on a/my bike. = I rode my bike to school.
I RIDE A BIKE[BICYCLE]TO SCHOOL\I GO TO SCHOOL BY BIKE[BICYCLE]
I go to school by bike.
I wen't to schoo by bike.
i have come to school by bike,用完成时表示此时说话人还在学校