祈使句的结构

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.