13.1 祈使句結(jié)構(gòu)
?
  祈使句用以表達(dá)命令,要求,請(qǐng)求,勸告等。

1) 祈使句有兩種類(lèi)型,一種是以動(dòng)詞原形開(kāi)頭,在動(dòng)詞原形之前加do (但只限于省略第二人稱(chēng)主語(yǔ)的句子)。
    Take this seat.
    Do be careful.
  否定結(jié)構(gòu):
    Don't move.
    Don't be late.

2) 第二種祈使句以let開(kāi)頭。
   Let 的反意疑問(wèn)句
  a. Let's 包括說(shuō)話者 
   Let's have another try,shall we / shan't we?
  = Shall we have another try?


  b. Let us 不包括說(shuō)話者
   Let us have another try,will you / won't you?
  = Will you please let us have another try?

否定結(jié)構(gòu):
  Let's not talk of that matter.
  Let us not talk of that matter.













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