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 overnight¹ 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。

　　Key phrases² and sentences
　　重要的短语和句子

　　You could go to Shanghai by train.
　　你可以乘火车去上海。

　　I like travelling by train.
　　我喜欢乘火车旅行。

　　It's more interesting.
　　乘火车更有趣。

　　Well, if you have time, you should consider it.
　　哦，如果你有时间的话，应该考虑乘火车。

　　How long does it take?
　　乘火车需要多长时间？

　　You can catch the overnight train.
　　你可以乘夜车。

　　It takes about 12 hours.
　　需要12个小时。

　　I'll think about it.
　　我会考虑的。

　　Maybe I will take the train.
　　也许我会乘火车去。