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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 。
Take this seat.
Do be careful.
否定结构：
Dont move.
Dont be late.
2) 第二种祈使句以let开头。
Let 的反意疑问句
a. Lets 包括说话者
Lets have another try，shall we / shant we?
= Shall we have another try?
b. Let us 不包括说话者
Let us have another try，will you / wont you?
= Will you please let us have another try?
否定结构：
Lets not talk of that matter.
Let us not talk of that matter.