I'm going to China by ship.
come,go,leave,arrive等表示位置移动的动词常用现在进行时表示将要发生的动作,它们很少与be going to 结构连用.
例如我们不会说:Miss Sun is going to come tonight.
而是说 :Miss Sun is coming tonight.
我们也不会说:He is going to go to school.
而是说: He is going to school.
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