The imperative is used for demands and commands.
Since it only works when you are directly talking to someone and saying what they should or must do, it only exists in the "you" forms: "du," "ihr," and the formal "Sie."
In the formal form, the imperative is constructed with infinitive + Sie.
In the plural form, we use the conjugated present tense of the verb (2nd person plural) without the pronoun.
In the singular form, we use the conjugated form (2nd person singular) without the ending and leave out the pronoun.
For strong verbs, the vowel change from "e" to "i/ie" is also done in the imperative form. The vowel change from "a" to "ä" is not.
To sound more polite or speak more formally, we can add an "e" to the end of the verb.
If the verb stem ends in "-d" / "-t" or "-m" / "-n," we MUST add an "e" to the end.
There are almost no irregular verbs in the imperative form. These are the only exceptions:
The verb always goes in position 1.
There is only a subject in the formal form ("Sie").
Separable verbs are also separated in the imperative form. The prefix goes to the end of the sentence.
When spoken quickly and loudly, the imperative is always impolite and unfriendly!
The words "bitte" or "bitte mal" make the sentence more polite and friendlier.
If you aren’t really mad at somebody, you always should use "bitte" together with the imperative form. Without "bitte" people will definitely perceive it as rude and unfriendly.
To express yourself even more politely, use the subjunctive 2: