Moods in Verbs
Some verbs are in the imperative mood, which expresses commands or
requests. Though it is not stated, the understood subject of imperative
sentences is you.
Examples:
Interrogative
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

Be here at seven o'clock. (Understood: You be here at seven o'clock.)
Cook me an omelet. (Understood: You cook me an omelet.)
Bring your books with you. (Understood: You bring your books with you.)

The interrogative (indicating a state of questioning): "Will you leave me
alone now?" One marker of the interrogative is that frequently the speaker
inverts the subject-verb order by placing the helping verb first, before the
subject:
"Will you leave me alone?" instead of "You will leave me alone."
Frequently the interrogative appears with requests for a course of action or
Verb,
subject
Imperative
He was here.
I am hungry.
She will bring her books.
Command, request
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Fact
Examples:
Opinion
Most verbs we use are in the indicative mood, which indicates a fact or opinion:
(YOU) understood
Indicative
requests for information.
Conditional
The Conditional Mood regards the action as not factually occurring in
reality, but only as a result of a potential fulfillment of some condition.
If…then
• The Present Conditional (would+base verb) expresses hypothetical results,
reporting what someone said, and in polite speech.
If I won the lottery, I would go on a trip around the world.
• The Past Conditional (would+ have+ past participle form of the verb) expresses
hypothetical outcomes that may have occurred in the past and can no longer be
achieved.
If you had told me about the party, I would have come with you (but you didn’t).
When you express a wish or something that is not actually true, use the past tense or
past perfect tense; when using the verb 'to be' in the subjunctive, always use were
rather than was:
Examples:
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
If he were here... (Implied: ...but he's not.)
I wish I had something to eat. (Implied: ...but I don't.)
It would be better if you had brought your books with you. (Implied: ...but
you haven't brought them.)
could, would
When verbs show something contrary to fact, they are in the subjunctive mood.
If, might,
Subjunctive