In forming the negative the auxiliary verb "to do" is always used, even with the verb "to be"
The imperative mood expresses a command or a requestBe quiet and hear what I tell you
Expressive of command; containing positive command; authoritatively or absolutely directive; commanding; authoritative; as, imperative orders., Not to be avoided or evaded; obligatory; binding; compulsory; as, an imperative duty or order., Expressive of commund, entreaty, advice, or exhortation; as, the imperative mood., The imperative mood; also, a verb in the imperative mood.
The imperative mood is commanding: Come here. Stop! Don't do that. Have a good vacation!
Expressive of command; containing positive command; authoritatively or absolutely directive; commanding; authoritative; as, imperative orders., Not to be avoided or evaded; obligatory; binding; compulsory; as, an imperative duty or order., Expressive of commund, entreaty, advice, or exhortation; as, the imperative mood., The imperative mood; also, a verb in the imperative mood.
Three: the indicative mood, the imperative mood and the subjunctive mood
The Imperative Mood can be used only in the second person. The subject of the sentence is often omitted when the Imperative Mood is used. In such sentences, the subject you is said to be "understood".
The mood of the verb "take" in the sentence "Take cover immediately" is imperative. Imperative mood is used to give commands or make requests. In this sentence, the speaker is giving a direct command to the listener to take cover immediately.
imperative
Imperative A+
imperative
The verb phrase "take cover" is in the imperative mood in this sentence. The imperative mood is an order, as when you tell someone to do something. The unstated subject of the sentence is "you": "[You] take cover..."
In modern English the imperative mood has only one form, which coincides with the infinitive without the particle "to"Please put the papers on the table by the bed