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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