No dispares el arma.

Because this is a negative tú command.

In Spanish, affirmative and negative commands for tú use different forms:

• Dispara = Shoot!
• No dispares = Don’t shoot!

For negative tú commands, Spanish uses the present subjunctive form. So:

• infinitive: disparar
• yo form: disparo
• subjunctive stem: dispar-
• negative tú command: no dispares

So No dispares is the correct way to say Don’t shoot when speaking informally to one person.

A very useful pattern is:

• No + present subjunctive

For -ar verbs:

• hablar → no hables
• mirar → no mires
• disparar → no dispares

For -er / -ir verbs:

• comer → no comas
• vivir → no vivas

A quick way to build it:

1. Start with the yo form in the present.
2. Remove the -o.
3. Add the opposite ending.

So for disparar:

• yo disparo
• remove -o → dispar-
• add -es → dispares

Then add no:

• No dispares

In Spanish, no normally goes directly before the conjugated verb:

• No dispares
• No hablo
• No corras

So No dispares el arma follows the normal word order for negation.

English uses do not + verb, but Spanish usually just uses no + verb.

Because Spanish often leaves out subject pronouns when they are already clear from the verb form.

In No dispares, the ending -es tells you it is addressed to tú. So tú is not needed.

You could say:

• Tú no dispares el arma

but that usually adds emphasis, contrast, or emotion. In normal speech, the simpler version is more natural:

• No dispares el arma

Great question. Arma is indeed a feminine noun, but in the singular it uses el instead of la because it begins with a stressed a- sound.

So you say:

• el arma
• el agua
• el águila

But the noun is still feminine, which you can see with adjectives:

• el arma peligrosa
• el agua fría

And in the plural, it goes back to las:

• las armas

So el arma is correct even though arma is feminine.

Because in Spanish, articles such as el, la, los, las are used much more often than in English.

With a direct object like arma, Spanish normally needs an article or some other determiner:

• No dispares el arma = Don’t fire the weapon
• No dispares un arma = Don’t fire a weapon
• No dispares esa arma = Don’t fire that weapon

But No dispares arma sounds incomplete or unnatural in standard Spanish.

Yes. If the context is clear, No dispares is perfectly natural and often more likely in real life.

Examples:

• If someone is pointing a gun, No dispares is enough.
• If you specifically want to mention the weapon, you can say No dispares el arma.

So the longer sentence is grammatical, but the shorter one is often more natural when everyone already knows what is being talked about.

Here, disparar means to shoot or to fire.

It is commonly used with guns and other weapons:

• disparar un arma = to fire a weapon
• disparar = to shoot
• disparar a alguien = to shoot at someone

It can also have other meanings in other contexts, such as something rising sharply:

• Los precios se dispararon = Prices shot up

But in No dispares el arma, the meaning is clearly the literal one: don’t fire the weapon.

The form changes depending on who you are addressing.

Informal singular (tú):

• No dispares el arma

Formal singular (usted):

• No dispare el arma

Informal plural in Spain (vosotros):

• No disparéis el arma

Formal plural (ustedes):

• No disparen el arma

Since you asked about Spanish from Spain, the vosotros form is especially relevant.

In a negative command, object pronouns go before the verb.

So:

• No la dispares = Don’t fire it

This is different from affirmative commands, where pronouns are attached to the end:

• Dispárala = Fire it

So the contrast is:

• No la dispares
• Dispárala

That placement rule is very important with commands in Spanish.

It is grammatical, but in everyday speech people might often choose a slightly different wording depending on context.

Possible natural alternatives:

• No dispares = Don’t shoot
• No dispares con el arma = Don’t shoot with the weapon
• No uses el arma = Don’t use the weapon

No dispares el arma is understandable and correct, especially if the focus is specifically on firing the weapon, but real-life phrasing depends a lot on the situation.