名词 imperative:

1. a mood that expresses an intention to influence the listener's behavior

2. some duty that is essential and urgent

imperativeadj.紧要的；必要的；祈使的n.紧要的事；命令；义务；驱使imperative idea强迫观念imperative usage使动imperative forms祈使句imperative order绝对命令imperative macro执行宏指令imperative needs紧急的需要imperative meaning祈使意义imperative content强制性条文imperative program命令式程序imperative language强制性语言

1. You use some question tags to make imperatives more polite.
   反意疑问句也用以使祈使句更礼貌。
2. Response to Chinese imperatives can be divided into refusals and acceptances.
   汉语祈使句的言语应答可以分为接受式应答和拒绝式应答两种。