>
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.
[ 结 束 ]
