I usually go to Beijing by train instead of going by plane.

我通常坐火车去北京，而不是坐飞机。

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Three of us are going by plane.

我们中间三个人坐飞机去。

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Are you going by plane?

你们准备乘飞机去吗？

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Are you going by plane?

你要坐飞机去吗？

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Tom replied that he was going by plane.

汤姆回答说他将坐飞机去。

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They replied that they were going by plane.

他们答复说他们将乘飞机去。

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They replied that they were going by plane.

他们答复说他们将乘飞机去。

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