Job creation has become an imperative for the government.创造就业机会是政府必须做的事。
“Stop!” isn't an imperative.stop不是祈使语气的动词。

［同义词］ adj. essential, necessary, urgent

imperative用作形容词的基本意思是“必要的,紧急的,极重要的”,在句中多用作表语,在“It is/was imperative that-clause”结构中从句的谓语动词多用虚拟式,英式英语中常用“should+动词原形”,而在美式英语中则常省略should。

用作定语
▲～+n.
He always speaks in an imperative tone of voice.他老是用命令的口吻讲话。
The imperative mood is a kind of grammatical phenomenon.祈使语气是一种语法现象。
用作表语
▲S+be+～
These instructions are imperative.这些命令必须得服从。
In business, a prompt reply is imperative.在商业上迅速的回复是必要的。
It was an important suit, and great accuracy was imperative.这是一宗很重要的诉讼案,有必要搞得很精确。
▲It is/was+～+for sb+to-v
It is imperative for you to come.你无论如何要来。
It's imperative for him to be taken to hospital at once because he is seriously ill.由于病得厉害,必须立即把他送到医院。
▲It is/was+～+that-clause
It is imperative that we should build a stable economy.我们必须建立稳定的经济。
It's imperative that you arrive before seven o'clock.你必须七点之前到。