When you go by train,please see to it

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When you go by train,please see to it that you take an express,one that stops only at big stations.你坐火车去时,请确保你乘快车,只在大车站停.
1、see to it （that）注意,留心；设法使；确保；务必 it是形式宾语,真正的宾语是that you take an express,one that stops only at big stations.
例子：Please see to it that the packing is strong enough to withstand rough handling.请务必做到包装牢固,经得起粗暴的搬运.
2、one是an express的同位语,one后面的that stops only at big stations是修饰one的定语从句,关系词在从句中作主语.