You could go to Shanghai by train.

　　你可以乘火车去上海。

　　A You could go to Shanghai by train.

　　A 你可以乘火车去上海。

　　B I like travelling by train. It’s more interesting.

　　B 我喜欢乘火车旅行。乘火车更有趣。

　　A Well, if you have time, you should consider it.

　　A 哦，如果你有时间的话，应该考虑乘火车。

　　B How long does it take?

　　B 乘火车需要多长时间？

　　A You can catch the overnight train. It takes about 12 hours.

　　A 你可以乘夜车。需要12个小时。

　　B I’ll think about it. Maybe I will take the train.

　　B 我会考虑的。也许我会乘火车去。

　　Notes 注释

　　1 If you suggest a possibility, you can use could / could, e.g. You could go to Shanghai by train. / You could go to Shanghai by train.; You could catch the 10 o’clock flight / You could catch the 10 o’clock flight.

　　如果你建议某种可能性，可以用could /可以，例如：You could go to Shanghai by train. /你可以乘火车去上海。; You could catch the 10 o’clock flight. / 你可以赶上10点的航班。

　　2 Remember, you can also use should / should when you make a suggestion: You should consider it. / You should consider it.

　　请记住，当你在提出建议时也可以用should /应该：You should consider it. /你应该考虑一下。

　　3 When you ask how long a journey or a train trip or a flight takes, you usually reply: It takes . . . / It takes . . . e.g. It takes about one hour. / It takes about one hour; The Beijing- London flight takes about 10 hours. / The Beijing - London flight takes about 10 hours.

　　当某人问旅程，如乘火车或者飞机需要多长时间时，通常可以这样回答：It takes . . . / 它需要 . . . 例如: It takes about one hour. / 大约需要1小时; The Beijing-London flight takes about 10 hours. / 北京到伦敦的航班需要10个小时。