They go to the United States by
问题描述：
They go to the United States by
答
他们坐飞机去美国。
答
她们乘飞机去美国
答
does he? does he? 加在原句后面，原句，改。 does he? ..They agreed that the United States shouldn’t make a war on Iraq,
答
他们乘飞机去美国
答
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