Based on whether verbs express facts, commands, questions, surprises, possibilities, wish, or conditions, they are categorized into various groups.

'The imperative mood' is used to give orders, commands, or instructions. This mood is formed using the main verb in the imperative form, which is typically the bare infinitive (i.e., the infinitive without 'to') used at the beginning of a sentence.
Imperative verbs are categorized into two groups based on whether the command is to do or not to do the action:

To form a negative command in the imperative mood, the auxiliary verb 'do' is followed by the word 'not' before the bare infinitive.

'The imperative mood' usually does not include a subject at the beginning, but the subject is always the pronoun 'you' that can be hidden or not.

Declarative mood describes the type of sentence that makes a statement or declaration or provides information about something. In other words, a declarative sentence is a sentence that declares or asserts a fact, opinion, or idea. Sentences in declarative mood typically begin with a subject followed by a verb, although other word orders are possible too.
There are two kinds of declarative moods in English:

'The interrogative mood' is used to ask questions. In other words, an interrogative sentence is a sentence that seeks information or clarification. There are two kinds of interrogative questions:

Obviously, a question mark is used at the end of interrogative sentences. Take a look at some examples:

'The exclamatory mood' describes a strong emotion or surprise. An exclamatory sentence is a sentence that conveys excitement, admiration, fear, anger, or any other intense feeling. Exclamatory mood is identified by the use of exclamation mark at the end of the sentence, as any verb can be used in the exclamatory mood.

The subjunctive mood is used to describe situations that are hypothetical, contrary to fact, or uncertain, unlike the declarative mood. It is often used to express wishes, opinions, obligations, emotions, and other non-realistic scenarios. The key feature of the subjunctive mood is that it is used to refer to events that may not have occurred yet or are unlikely to occur.

The subjunctive mood is mostly used in:

The conditional mood is used to express events or actions that are dependent on a certain condition or circumstance, and may or may not happen. It is often used to express a hypothetical situation, a possibility, or a conjecture.

There are five types of conditional moods in English:

Zero conditional mood expresses a general truth or fact, and implies that a particular action or result will always follow a certain condition.
The zero conditional is typically formed using the present tense in both clauses of the sentence, with the word 'if' introducing the condition. For example:

'The first conditional mood' refers to a future event that is likely to happen if a specific condition is met. The conditional clause expresses this condition, and is often introduced with the word 'if'. The first conditional mood is used to express a possible or probable future outcome, based on a particular condition being fulfilled. Check out the examples:

'The Second conditional' refers to a hypothetical situation that is unlikely or impossible to happen in the present or future. It is often used to express a situation that could have happened differently, or to make a suggestion, or express a wish that is unlikely to be fulfilled. The second conditional is usually formed using the past tense in the conditional clause and the modal verb 'would' in the main clause. Pay attention to the examples:

The third conditional refers to a hypothetical situation or event that did not happen in the past, and is used to express a regret or a missed opportunity. It is often used to imagine what could have happened differently in the past if circumstances had been different.
The third conditional is usually formed using the past perfect tense in the conditional clause and the modal verb 'would have' in the main clause. Here are some examples.

The mixed conditional is a type of conditional sentence that combines elements of the second and third conditional moods. It is used to express a hypothetical or unreal situation in the present or future that is linked to a past event or condition. In a mixed conditional sentence, one clause typically uses the past tense, while the other clause uses the present or future tense. Here are the examples:

The state or form of a particular verb is described by a mood. There are six different moods in English as follows.