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13.1 祈使句结构

      祈使句用以表达命令,要求,请求,劝告等。

    1) 祈使句有两种类型,一种是以动词原形开头,在动词原形之前加do (但只限于省略第二人称主语的句子)。
        Take this seat.
        Do be careful.
     否定结构:
       Don't move.
       Don't be late.

    2) 第二种祈使句以let开头。
      Let 的反意疑问句
     a. Let's 包括说话者 
       Let's have another try,shall we / shan't we?
      = Shall we have another try?

     b. Let us 不包括说话者
       Let us have another try,will you / won't you?
      = Will you please let us have another try?

    否定结构:
     Let's not talk of that matter.
     Let us not talk of that matter.

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