No debemos destruir el bosque.

In Spanish, no normally goes directly before the conjugated verb to make the sentence negative.

So:

• Debemos destruir el bosque. = We must destroy the forest.
• No debemos destruir el bosque. = We must not / should not destroy the forest.

Here, the conjugated verb is debemos, so no comes before it.

Debemos is the first-person plural form of deber in the present tense.

It can mean:

• we must
• we should
• we ought to

The exact shade of meaning depends on context. In No debemos destruir el bosque, it can sound like either:

• a moral recommendation: we shouldn’t destroy the forest
• a stronger obligation: we must not destroy the forest

Because after deber, Spanish normally uses an infinitive.

This is the same basic pattern as in English:

• must destroy
• should destroy

So:

• debemos destruir
• not debemos destruimos or another conjugated form

The first verb (debemos) is the one that changes to match the subject; the second verb stays in the infinitive.

Debemos is:

• present tense
• indicative mood
• first person plural

That means the subject is we.

The full form would be:

• (Nosotros) no debemos destruir el bosque.

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

Yes, absolutely.

Spanish often omits nosotros because debemos already tells you the subject is we. But you can include it for:

• emphasis
• contrast
• clarity

For example:

• Nosotros no debemos destruir el bosque, pero ellos sí quieren hacerlo.

Without emphasis, the shorter version is more natural:

• No debemos destruir el bosque.

El bosque means the forest. It usually refers to:

• a specific forest already known from context, or
• the forest as a general idea, especially in environmental language

Spanish often uses the definite article more than English does.

Compare:

• No debemos destruir el bosque. = We shouldn’t destroy the forest.
• No debemos destruir un bosque. = We shouldn’t destroy a forest.
  This sounds more like any one forest or a particular forest not yet identified.

So el bosque is the most natural choice if you mean the forest in a general or familiar sense.

No. They are different.

• No debemos destruir el bosque = We must not / should not destroy the forest.
• No tenemos que destruir el bosque = We don’t have to destroy the forest.

This is a very important difference.

The first means destruction is wrong or forbidden.
The second means there is no obligation to destroy it.

So they are not interchangeable.

In standard Spanish, especially in careful usage in Spain:

• deber + infinitive usually expresses obligation
• deber de + infinitive often expresses probability or assumption

So:

• Debemos destruir el bosque. = We must destroy the forest.
• Deben de estar en casa. = They are probably at home.

In everyday speech, people do not always keep this distinction perfectly, but it is a useful rule to learn.

In your sentence, debemos destruir uses deber for obligation, which is exactly what you would expect.

Normally, no. In this sentence, the natural structure is:

• No debemos destruir el bosque.

That is because no usually negates the main conjugated verb, which here is debemos.

If you say debemos no destruir el bosque, it sounds unusual and marked. It may be understood, but it is not the normal way to say it.

So for ordinary Spanish, use:

• No debemos destruir el bosque.

A helpful approximation is:

• des-tru-IR

The stress falls on the last syllable: -ir.

A few pronunciation notes:

• d in Spanish is softer than English d
• r at the end is a light tap, not a strong English r
• ui is pronounced as two vowels said quickly together

So destruir is not like English destroy in sound, even though the meaning is related.

Yes, it could be plural, but the meaning would shift a bit.

• el bosque = the forest
• los bosques = the forests / forests in general

Spanish can use the singular definite form to talk about something as a category or concept. So el bosque can sound like the forest as an environmental idea.

If you wanted to talk about forests more generally in the plural, you could also say:

• No debemos destruir los bosques.

Both are possible; the choice depends on what exactly you want to emphasize.

Not exactly. Grammatically, it is a statement in the present indicative, not an imperative command form.

It literally has the structure:

• we must/should not destroy the forest

So it expresses:

• obligation
• advice
• moral judgment

It may feel like a command in meaning, but it is not built with the imperative.

For example, a direct command to a group would look different:

• No destruyáis el bosque.
  This is a true negative command in Spain Spanish, addressed to vosotros.

So your sentence is more like a statement about what we ought not to do.