They go to the United States by

问题描述:

They go to the United States by

他们坐飞机去美国.
这句话也可以说成:
They take a plane to the United States.
by plane是抽象的交通方式,plane前面不能用冠词;take a plane是具体的交通方式,plane前面可以用冠词.
与此相似的有:
by bus---take a bus
by sea---take a ship
on foot---walk
等等