我妈妈经常乘公交车上班.
My mother often goes to work (by)(bus).
My mother often goes to work (on)(the)(bus).
你可以骑自行车去邮局.
You can go to the post office (by)(bike).
You can (ride)(a)(bike)to the post office
我妈妈经常乘公交车上班.
My mother often goes to work (by)(bus).
My mother often goes to work (on)(the)(bus).
你可以骑自行车去邮局.
You can go to the post office (by)(bike).
You can (ride)(a)(bike)to the post office