祈使句的結(jié)構(gòu)

祈使句用以表達命令，要求，請求，勸告等。

1） 祈使句有兩種類型，一種是以動詞原形開頭，在動詞原形之前加do (但只限于省略第二人稱主語的句子)。 Take this seat. Do be careful. 否定結(jié)構(gòu)： Don't move. Don't be late.

2） 第二種祈使句以let開頭。 Let 的反意疑問句 a. Let's 包括說話者 Let's have another try，shall we / shan't we? = Shall we have another try?

b.Let us 不包括說話者 Let us have another try，will you / won't you? = Will you please let us have another try?

否定結(jié)構(gòu)： Let's not talk of that matter. Let us not talk of that matter.