How long does it take to fly to Shanghai?

　　乘飞机到上海需要多长时间？

　　A I suppose that to go by train is cheaper, but I don’t have much time.

　　A 我想乘火车更便宜一些，但是我没有那么多的时间。

　　B Maybe you should go by air. It ’ll be much quicker.

　　B 也许你应该乘飞机去。那会快很多。

　　A How long does it take to fly to Shanghai?

　　A 乘飞机到上海需要多长时间？

　　B It’s only about an hour.

　　B 大约只需要一个小时。

　　A And there are many flights every day, aren’t there?

　　A 每天都有很多次航班吗？

　　B Yes, but it’ll be more expensive than travelling by train.

　　B 是的，但是乘飞机比坐火车要贵得多。

　　Notes 注释

　　1 If you want to ask how much time something takes, you can say: How long does it take to fly to Shanghai? / How long does it take to fly to Shanghai? ;How long does the opera last? / How long does the opera last?

　　如果你要问做某事需要多长时间，你可以说：How long does it take to fly to Shanghai? / 乘飞机到上海需要多长时间?；How long does the opera last? / 歌剧演出要多长时间?

　　2 Remember, if you only compare two things, use the comparative form: it is much quicker /it is much quicker; It’s more expensive than travelling by train. / It’s more expensive than travelling by train.

　　记住，如果你想比较两个事物，用比较级形式：it is much quicker / 快得多; It’s more expensive than travelling by train. / 比乘火车要贵得多。