It is imperative that all kitchen employees wear their hats, coats, and plastic gloves at all times.

imperative  adj. 必要的；緊急的；極重要的

It is imperative to act now.

現在必須行動起來。

He made an imperative gesture.

他做了個命令式的手勢。

a. 必要的；緊急的

同義字:

urgent 

necessary

compulsory

compelling

crucial

critical

mandatory..

It is necessary that this project ______ finished by the end of this month so that we can have ample time to deal with other important things.

A) is

B) will be

C) has 

D) be

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(D)

It is necessary that he finish the work before leaving.

It is important that he do this work now.

凡表[必須的]形容詞,有以下8個如:

necessary

imperative  (有絕對必要的)

essential

important

urgent

desirable  (合意的)

recommendable   (值得推薦的)

advisable   (明智的)

等,在下列句構中出現時,主詞之後應使用助動詞should,而should可以省略,保留之後的原形動詞.

例如:

It is necessary that he (should) finish the work before leaving.

It is important that he (should) do the work now.