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.