注：第二行第二个是 even though，制作表格的时候出错了，特此更正。
    although, though 等与 but不可同时使用。
    - Although my grandfather has lots of money, he doesn't feel happy.
    - 尽管我的祖父很有钱，但他并不感到幸福。
    no matter + wh-等同于wh-ever。
    - No matter what he did, nobody liked him.
    - Whatever he did, nobody liked him.
    - 无论他做了什么，都没人喜欢他。
    as 和 though 引导的从句，需使用倒装。
    - Ugly as he is, many girls love him.
    - 丑陋如他，都有很多女孩喜欢。
    while 引导让步状语从句时，和 although 等意思相同，但只能用于句首。
    - While I agree with your plan, I have no money to practice.
    - 尽管我赞同你的计划，我却没有钱去实施。
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