经典句型:Traveling by bus is so convenient. 乘公交车很方便。
A:I will go to work by bus tomorrow.
甲:明天我要乘公交车上班。
B:Why don't you drive to work?
乙:为什么不开车上班了呢?
A:Traveling by bus is so convenient.
甲:乘公交车很方便。
B:Don't you think it wastes time?
乙:你不认为很浪费时间吗?
A:No.It's much faster than before.
甲:不。比以前快多了。

经典句型:Traveling by bus saves money. 乘公交车很省钱。

A:Traveling by bus saves money.
甲:乘公交车很省钱。
B:Yes.It is much cheaper than driving a car.
乙:是的。比开车经济多了。
A:It also contributes to environmental protection.
甲:还有助于环保。

句型讲解：
Save money意思是“省钱”，save是“节省”的意思。再如:save time省时，save for a vacation为假期攒钱。Contribute to意思是“有助于”。如:The arrangement will contribute to cement our pleasant relationship.此项安排有助于巩固我们良好的关系。