by bus的過去式

　　You'd be better going by bus.

　　你坐公共汽車去會更好些。

　　He goes to work by bus.

　　他乘公共汽車去上班。

　　They had to travel everywhere by bus.

　　他們只得乘公共汽車出行。

　　They criss-crossed the country by bus

　　他們乘公共汽車游歷這個國家。

　　It's cheaper by bus, but the train is a lot quicker, so it's as broad as it's long.

　　乘公共汽車便宜，但坐火車快得多，所以各有優(yōu)點。